Malicious PDF — malware analysis report

Static analysis result for SHA-256 559fe7d0acf927a1…

MALICIOUS

PDF

74.2 KB Created: 2021-03-27 16:25:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ab16cc39bbf71bd4de7b9fd73e770646 SHA-1: 307a8c95c01b768fb091095b5a750fb2c81bd257 SHA-256: 559fe7d0acf927a1105cde9800f44f7f5426ff0d3e9a5304e3b42b25231dc9c3
244 Risk Score

Malware Insights

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

This PDF document is identified as malicious due to its extensive use of embedded links, many of which lead to known malicious redirectors or disposable hosting. The document body, though heavily obfuscated, suggests a lure related to software requirements elicitation, likely a pretext for directing users to malicious sites. The presence of numerous links and the ML classifier's high confidence score indicate a deliberate attempt to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/123?utm_term=software+requirements+elicitation+questions+template In PDF document text
    • https://wiwupaluw.weebly.com/uploads/1/3/1/6/131606778/2e19f2159.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/sadukibobod.pdfIn PDF document text
    • https://rexerobebaru.weebly.com/uploads/1/3/1/8/131872155/9ee56e718b6035.pdfIn PDF document text
    • https://wimaxexuxiwob.weebly.com/uploads/1/3/0/8/130874544/8995660.pdfIn PDF document text
    • http://custits.space/dell_poweredge_r710_price_in_pakistanz7h2u.pdfIn PDF document text
    • http://onlineeshop24.xyz/wegiza7tabr.pdfIn PDF document text
    • https://wazuwivanesigov.weebly.com/uploads/1/3/4/4/134431766/pinutef.pdfIn PDF document text
    • http://table-wait.com/bluecoat_proxysg_admin_guide_6._5xur21.pdfIn PDF document text
    • https://tupodoki.weebly.com/uploads/1/3/0/7/130776149/kitawobura.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_9d44d0002d714300bcedfd63d0eb5ce9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d1f01e-18d1-44a6-a815-250d7163a69f/are_dixie_chopper_mowers_any_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3291e3f2-0059-4b58-89de-c6d6fd86dc81/vitamix_blender_troubleshooting_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cbe24a2-947e-46a2-bcdb-baf44a87cc41/sony_home_theatre_bdv_e3100_review.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_d47d230356164dc3a6e769d81e447eb2.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_c6fa06a6a95e47eb8d67e6b30750b802.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e35b64-dcd9-4ffd-a630-dfd3fba6ebde/jesus_healing_the_blind_verses.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_4dede9f17f7e4a118928d2f14151b629.pdf?index=trueIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_9765bd51b468431487e14e40b26db13a.pdf?index=trueIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_d3e49e972c92427db87e80d34f5d36dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/394981ec-0f43-4031-8d56-23738836c4e4/kosixub.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_off0000e209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE209 5484 bytes
SHA-256: 9c88007fb760a08b17e8b95508d814bbe37644d08cc124d38b0f390f87776ee1
font_01_sfnt_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 11232 bytes
SHA-256: a47798ac4ab1fec7dec94a66eb8211f5abaf59284fbaa64da542c397a9f57e1e

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