Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63cbf2da176918a…

MALICIOUS

PDF

73.7 KB Created: 2020-12-25 23:59:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3d14bdda8b6c6e53aedd80746cd125e7 SHA-1: 8442b1d40b8afd7886ca29f19d4cce099163cc1e SHA-256: c63cbf2da176918aee8e8361deee182310307d779e7150b41204b5dcd14b200f
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=11m+to+ft In PDF document text
    • https://vobuzotoxat.weebly.com/uploads/1/3/4/7/134705481/nopotut-rowazivefek.pdfIn PDF document text
    • https://cdn.sqhk.co/meradipuwiz/kZiblzi/wojurodukekimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_5f9673a533f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453740/normal_5fba26843a162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465703/normal_5fa9444e358e4.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/2011789.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/96a2b618-87d1-49cd-a3a8-1db20f244dc2/baroque_architecture_characteristics.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/77051083395.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/the_goodly_spellbook.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/pepezeratexoxidibojolekim.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/20224542359.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD232 4356 bytes
SHA-256: 48ab68d417a53284a4ec87d24ba30f2800a93ffc39a165ef3ce4ea85542c7838
font_01_sfnt_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 10468 bytes
SHA-256: dd76f5ff90e15fb1b6d719e75dae15b57e3b86924d71c3edacf9ceff79f729cd
font_02_sfnt_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 16216 bytes
SHA-256: 70f40d70559aacc935f14be6aa78542955531c8ec73b35d0bb8c03e7c63a2f02

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