Malicious PDF — malware analysis report

Static analysis result for SHA-256 76169f45b4cec338…

MALICIOUS

PDF

83.5 KB Created: 2021-04-09 13:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b3fa9daaa6c48ee8ebe94cddcd241cee SHA-1: d5933e0e8d2a5571a2763d26fbad3b56328cc441 SHA-256: 76169f45b4cec338e7e990b963046694cae8702a2d1207dbbf5295c9accc9412
264 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical detection for a redirector link and a machine learning model. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of a callback lure heuristic further indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=samsung+refrigerator+rf267abrs+ice+maker In PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/4030121047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_60652126d3cb4.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/cxigVHx/how_to_draw_cartoon_animals_in_easy_way.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/lrgjheI/wudosuvomizun.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/gdot7hb/6248937371.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/iRmJhgn/sports_board_games_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443344/normal_600a55193e664.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_8cd34cd9cd364de39aab2109fbb6a93f.pdf?index=trueIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_8eb36a495760448e879f7c6e07aeead5.pdf?index=trueIn PDF document text
    • http://tulazupuvive.epizy.com/akinator_apk_full_gratis.pdfIn PDF document text
    • http://padusij.onlinewebshop.net/contrastive_and_error_analysis.pdfIn PDF document text
    • http://ralavokapijalig.rf.gd/carpophilus_dimidiatus.pdfIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_dc4494738f5140638bf0ae28b9432811.pdf?index=trueIn PDF document text
    • http://bibezakomi.myartsonline.com/23926965461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c46d4d-2700-4583-9193-c9a2ff35fc45/59843028528.pdfIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_ccfe550a8355452180f22e3075bfd217.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a6a96d-63ca-4446-a046-b6ab5ace67a6/arc_welding_questions_and_answers.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_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 5844 bytes
SHA-256: 436084f4372d9777151883c7fc370c5ac057e873031e7d7fa4113c5f1a9cd665
font_01_sfnt_off00011b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B28 11048 bytes
SHA-256: ae9af04a7a0929fd846bf8dd92477abbda888ccda4efd9a03cc0fb9f4939db25