Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef765b8725a2d326…

MALICIOUS

PDF

76.6 KB Created: 2021-05-23 21:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 123a731c6d9ba214a8b1e1933144e09c SHA-1: 802ce9668161bcc0c4deae858f376ac463e26b28 SHA-256: ef765b8725a2d32664471da18127671151447cde5cc9b774344fb0c43196e62d
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many of which point to disposable hosting and redirect to malicious infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'arrest records', likely intended to trick the user into clicking a malicious link. The presence of numerous SEO-optimized PDF links further indicates a campaign to distribute malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=clarke+county+arrest+records In PDF document text
    • https://banetopebored.weebly.com/uploads/1/3/4/8/134874573/nodapupebodiralefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495254/normal_5fd6b0b3a6e5f.pdfIn PDF document text
    • https://letitelow.weebly.com/uploads/1/3/4/5/134500939/c8a68ae03.pdfIn PDF document text
    • https://jikovezogid.weebly.com/uploads/1/3/1/4/131407088/wesomezekozus.pdfIn PDF document text
    • https://xopilinunerixaw.weebly.com/uploads/1/3/1/3/131380618/4b3aee0fc86df7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_60425f245aea0.pdfIn PDF document text
    • https://vutojexi.weebly.com/uploads/1/3/0/7/130776275/35a0f5de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446263/normal_60201c6f47574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_6030153954116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481061/normal_5fec18d3218d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nowokil/kolufisilajazexev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a65284-5140-44b2-9fbf-52f60d868d99/61514056550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f641d34-dd56-4e2b-96f8-fce2ae1cbd5d/ancient_world_history_topics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5afd0218-d072-4486-8715-bc6db00b4dab/korg_x50_price_in_bangladesh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/669f66ae-b848-47b0-82e5-afbb1b8df6e4/miginanafavusumatutisiv.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/xexugexagawex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c9ebbd3-f053-4304-9475-46b353a8063c/22317564728.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/kuala_lumpur_restaurant_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5458d4-dae7-4c30-ba03-792dc65a9a36/gubidofurimametijapuboza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd6624c-0e62-40d9-8c54-a8e555fc1b62/cheap_dirt_bikes_near_me_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/91574911498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8918c6f-a458-4796-b786-d5c0c05ffb30/how_to_win_a_rubiks_cube_2x2.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/what_is_lucida_font.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36082631-af7c-44ec-8c06-f2d7c1e29e5c/do_resistance_bands_work_for_glutes_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceed024f-2b5e-47e1-b474-d565825406e9/jatavudewup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ca2200-079a-47b5-8a72-3b9f43d7fc60/good_soccer_training_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c29d4ea8-b8de-4731-92be-d2eec8927af6/does_verizon_have_any_flip_phones.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 5004 bytes
SHA-256: cf546b405516de43037864ae9322e2878b4cc46de48305e46dd0083f86f17159
font_01_sfnt_off0001001b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 10804 bytes
SHA-256: c903d3902002053d787226641468b61cb818c18a275f4e70bde44d42ba984fe6

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