Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac1b95cbfda9791…

MALICIOUS

PDF

67.4 KB Created: 2021-01-09 15:14:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7a4d98a4b07a07c251d067eacf129b28 SHA-1: 4281e7ecd30e3a4d56fb03d1116fc9f0f36dee26 SHA-256: 8ac1b95cbfda97915cfd156c76f8ad9beeac3a88e37f74c7efda1bdc528e6c9a
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, including a redirector and a link farm, suggesting an attempt to drive traffic to potentially harmful content. The embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://gettraff.ru/square?utm_term=payday+2+shackleton+auction+stealth+guide In PDF document text
    • https://jukamonasob.weebly.com/uploads/1/3/0/7/130740128/tukigenefane.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/hchdjc5/62393771661.pdfIn PDF document text
    • https://cdn.sqhk.co/kubezuvare/Sj9bFyQ/64332760496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479673/normal_5fbe53a7eaf19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421612/normal_5feda4eae77e5.pdfIn PDF document text
    • https://rapinawenag.weebly.com/uploads/1/3/0/9/130969945/dogutetasu-defisufi-lezipug.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/rjaf53w/30558449949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5fba1b59a1414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5f93ce817ae5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f875a9524d94.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/po3hfjb/asteroid_warning_2020_april_29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF97 2960 bytes
SHA-256: 3c6502e04658d985b37ed967139d4b1bb7136c1c8ff06868e6b64c17630b7d50
font_01_sfnt_off0000ca1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1A 5404 bytes
SHA-256: 929212a102f30481e5060769dd6803c6e958bebe3541f06c05ba5d4760fe6389
font_02_sfnt_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 9952 bytes
SHA-256: e609715ed15057776144f2e959e14aa3f7111360798f3b2057e891da8080ff20

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