Malicious PDF — malware analysis report

Static analysis result for SHA-256 c769d4aed3819906…

MALICIOUS

PDF

76.3 KB Created: 2021-03-09 14:53:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 309684490deb2cad55b72da7c002be21 SHA-1: b3ebc87c708afd3cf67ddec00942ca08401b4637 SHA-256: c769d4aed38199064d71dacad95aa1eecc8a510df7381978a55c80db851b9150
264 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various external websites, many of which are hosted on disposable domains. One critical heuristic indicates that a link leads to known malicious redirector infrastructure. Another heuristic flags the document as a callback lure, suggesting a phishing or scam attempt. While no scripts were explicitly extracted, the nature of the link farm and the malicious redirector strongly suggest an intent to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=plantronics+voyager+legend+manual+espa%25C3%25B1ol In PDF document text
    • https://fexedewikefitug.weebly.com/uploads/1/3/2/6/132681233/2908575.pdfIn PDF document text
    • https://zenugewitewane.weebly.com/uploads/1/3/5/9/135960096/1437397.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/ggifdhi/soccer_heads_world_cup_cool_math_games.pdfIn PDF document text
    • https://nudabixe.weebly.com/uploads/1/3/4/5/134505388/c4e1d88691cbae.pdfIn PDF document text
    • https://cdn.sqhk.co/gipagigo/cggpzNh/8767440882.pdfIn PDF document text
    • https://jawoxaze.weebly.com/uploads/1/3/0/9/130968973/1381498.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/zilixas-sepoz.pdfIn PDF document text
    • https://talogaxuzule.weebly.com/uploads/1/3/4/5/134596774/2580561.pdfIn PDF document text
    • https://lekumoga.weebly.com/uploads/1/3/2/6/132683130/dubadivepu.pdfIn PDF document text
    • https://tedotedonux.weebly.com/uploads/1/3/0/7/130775879/611592.pdfIn PDF document text
    • https://muwujexowosis.weebly.com/uploads/1/3/1/4/131437891/gapelapuwo.pdfIn PDF document text
    • https://taburexil.weebly.com/uploads/1/3/4/3/134374137/vagovi-lepude.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/C6jezgj/buzzards_bay_brewery_westport.pdfIn PDF document text
    • https://cdn.sqhk.co/bevurokakug/ekvWlhb/most_interesting_facts_about_asteroids.pdfIn PDF document text
    • https://sokowerifali.weebly.com/uploads/1/3/6/0/136053586/5d9e6ecd83b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_600a3bbb920f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376087/normal_600c3a2bce19c.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/hgofcjb/69964288959.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4abe00d6-3e29-4043-84cb-57896cd249d2/sony_str-dn850_firmware_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/137d38f6-77b3-474b-806f-075e0321b505/fawarorodokilalufilep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bab0b6f-54c5-4574-8222-d4199462b6e9/what_does_the_grand_inquisitor_represent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b38d476-03cb-437f-8d69-39966e0a1984/nipaporu.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_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 5768 bytes
SHA-256: 9e5de07f51f4d1cfc3f3f962f722f7a546eb8a9d388536435c3a300f6c36bb8d
font_01_sfnt_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 14872 bytes
SHA-256: c0acba5fe6950596545b6ee9ba8b1ab58cc573a335e446647b8ca7738b6f25c1