Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90c99a0e214608e…

MALICIOUS

PDF

73.5 KB Created: 2020-12-14 21:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7dac7e2ca6c874ed832f346188f7d680 SHA-1: b3eb8b4a1d578449aaf222aa8bf73172d13bae16 SHA-256: b90c99a0e214608e3e874e02495339925438b1adc3eacde8f858dfcccce27b24
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'mass external PDF link farm'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffnew.ru/123?utm_term=modes+of+failure+brittle+fracture PDF link annotation
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/4a3e59131.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/e4f0fd.pdfIn PDF document text
    • https://xozagalan.weebly.com/uploads/1/3/4/5/134519104/kuwox.pdfIn PDF document text
    • https://fikepeti.weebly.com/uploads/1/3/4/4/134489659/6935366.pdfIn PDF document text
    • https://bapadiwifujeki.weebly.com/uploads/1/3/4/0/134041393/12d62.pdfIn PDF document text
    • https://judunelikirolo.weebly.com/uploads/1/3/4/3/134375477/laramuniguzivenama.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0e940bd14ff0dd29cb4d3/t/5fc3b2c8173fb5383b143283/1606660810816/usmle_step_2_clinical_skills.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0696cdf132613bbbb46ad/t/5fc165ecf81c9a2a0cd6aa5a/1606510073611/rexenotukam.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc571d8a5bc066edfc42d69/t/5fd6fb65ffab5d3c561038a6/1607924583367/96203742360.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc68766ea4a794d566c19da/t/5fc9dcebe4017829c16cc133/1607064812582/movie_maker_online_g_video_editor.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0abc6bda9c57a97bd16fd/t/5fc9082a3da8de555823d72e/1607010347216/nedefemudapiv.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fceb09af4da4f68a32826c1/t/5fd21faab91f50015ef608be/1607606188948/45980104496.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc33b8b3dfdd95b60e431f6/t/5fc53dc9cb3e0f5771fa824b/1606761930346/the_hacker_playbook_2.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6483f8cdb769c6dae22e/1606378628915/daisuke_persona_4.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_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 5160 bytes
SHA-256: 01edfa811060487086e0a88155ee1d83621ac9ef3862dd6c24ea3f6112fef4be
font_01_sfnt_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 11136 bytes
SHA-256: bf989d3c3d4aaaf700e85b14a2625b5137d4576cc8b88dcf23f47473e08296e7

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