Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d063cbbd29b42c…

MALICIOUS

PDF

79.4 KB Created: 2021-05-17 03:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4fa1acbf49b6a99c85c47bc0832d7287 SHA-1: 05ba1354af8aaec1bcf2c8cb3226057dcc24c064 SHA-256: 37d063cbbd29b42cf683b8b23c618fb5b58ec862c344ccfc24beff9dcccabf26
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute traffic to potentially malicious sites. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://seumenha.ru/strik?utm_term=fluval+fx5+setup PDF link annotation
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485695/normal_600c1220e7645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_603d21561385d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369771/normal_60095f80b1425.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392658/normal_5fff055e6be9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409609/normal_6005863dcd56a.pdfIn PDF document text
    • http://vsedlyatebya.xyz/88202213349ketfi.pdfIn PDF document text
    • http://phtech.site/nobapipivund04g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498983/normal_5ff1d9743752b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365549/normal_5ff23c1c43a4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_60179c2ba8976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_603298cf45c4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459785/normal_60426dbf1bcd3.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://170d08c7-2527-4f8e-8bc4-cf7f6ffab704.filesusr.com/ugd/afe24e_f454da4bf1b84cbf83e92e5a542effbd.pdf?index=trueIn PDF document text
    • https://d3919fa5-c020-464c-a773-72e456e10464.filesusr.com/ugd/29136f_1c209c695cff4b01986a0443f60eba8c.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_6d5765278c3f4e75a3c8e8782c6b1dbf.pdf?index=trueIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_a04182e2cbf6487f9fe4c4bcc94f4653.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_ceaf5c6765b9405d88fead76d64af85c.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_eebbca904d9e40bb919fe9238f92cba4.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_ca7a4278c33547d9a8345600ca4872ab.pdf?index=trueIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_21df866dd4164ffcaf2eae4ffa6f3ba9.pdf?index=trueIn 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_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 5008 bytes
SHA-256: 0c540cac7e28296d0f17d75c6b714109b575c95a220e3810a78b4cfcb6fcbfbc
font_01_sfnt_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 10740 bytes
SHA-256: 0203334c8687ac754a82dc5bcd5330e9bfda1f75fa1a29ca29c20ff83f4764a4