Malicious PDF — malware analysis report

Static analysis result for SHA-256 704273e4d0e723bf…

MALICIOUS

PDF

67.8 KB Created: 2020-11-23 05:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41a49ce08ace23ca960888531c53dd23 SHA-1: d61484912da2dd9434e282aec3648c857634dcf5 SHA-256: 704273e4d0e723bf20239ddd21bdd4d09b1f48274c141368505696da5b24282e
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely intended to redirect users to malicious sites or download further malware. The presence of embedded URLs and a 'download button' lure reinforces this phishing and malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffine.ru/aws?utm_term=adjectives+and+adverbs+worksheet+esl
    • https://cdn-cms.f-static.net/uploads/4450434/normal_5fae3485b152b.pdf
    • https://cdn-cms.f-static.net/uploads/4374682/normal_5fb5e97066db3.pdf
    • https://cdn-cms.f-static.net/uploads/4446034/normal_5fab0a057294a.pdf
    • https://kegibaxita.weebly.com/uploads/1/3/4/6/134661687/muredifunipejowugi.pdf
    • https://cdn-cms.f-static.net/uploads/4401711/normal_5f987b05e2d2b.pdf
    • https://cdn-cms.f-static.net/uploads/4368781/normal_5fabbc1635886.pdf
    • https://cdn-cms.f-static.net/uploads/4413702/normal_5fa156a27be69.pdf
    • https://tosufiriro.weebly.com/uploads/1/3/4/4/134472590/e397e77522.pdf
    • https://cdn-cms.f-static.net/uploads/4418170/normal_5fb99fde9298f.pdf
    • https://cdn-cms.f-static.net/uploads/4453115/normal_5fad8eb04aab4.pdf
    • https://cdn-cms.f-static.net/uploads/4419412/normal_5f9a1e3c940fa.pdf
    • https://cdn-cms.f-static.net/uploads/4424632/normal_5f9a93009ef64.pdf
    • https://cdn-cms.f-static.net/uploads/4428052/normal_5fb46467bd654.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a42a0cc2-4a63-46ec-8697-1ee119656ebb/31873016234.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9a0.bin
2459e3c06965ef64581f6a60e4c1b48de0ff1f51c73742032cba98e2f818ea7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A0 5448 bytes
font_01_sfnt_off0000dc3c.bin
d4a07866a53935748ca19025ac8bc4a27988b2fc851f2a9e7e2554ff4906ffb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 10764 bytes