Malicious PDF — malware analysis report

Static analysis result for SHA-256 8539f4b446c735c7…

MALICIOUS

PDF

73.8 KB Created: 2021-02-22 00:15:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0a4ece365a2aac550d7db2c15d207f28 SHA-1: b631e2af17b88013633fb1fcf7d015c62801cfc5 SHA-256: 8539f4b446c735c71f73c7ded58bb60668d1874fabeb11be7ed67bc6d2eb0ffd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious phishing content. The primary URL suggests a lure related to car parts, likely to direct users to a malicious website for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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://maypoin.ru/strik?utm_term=2003+honda+civic+hybrid+battery+pack+replacement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447267/normal_5fe9ef78476ee.pdfIn PDF document text
    • https://kozoniwapi.weebly.com/uploads/1/3/4/0/134016697/3c1cf.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/nijjdJh/gorewaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/J5vKidD/truck_icon_vector.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/tWgfOr9/voxopomomovikin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480753/normal_5fe14600ce22f.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/jcibfrI/kevodedotaduwuj.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/Xj5idWc/vopozufaxinaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393353/normal_60010b94e6ae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502178/normal_60263575bd567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_6022de7f46583.pdfIn PDF document text
    • https://dukazisilibe.weebly.com/uploads/1/3/4/6/134679988/kilupot_zijuvagovan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462075/normal_600e9271973a5.pdfIn PDF document text
    • https://cdn.sqhk.co/govulasem/eMicjcd/52701597748.pdfIn PDF document text
    • http://vknacruckalaikov123.xyz/partitura_amparito_roca29c8e.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/cIUu0eJ/sabubosasitiviv.pdfIn PDF document text
    • https://cdn.sqhk.co/pabulibig/RTYDZhe/wild_west_heroes_discord.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 5844 bytes
SHA-256: 7c2ebcadb638ed1e30bf23a1129852d5378579c38b5e120e3ff7c4a185737c5e
font_01_sfnt_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 11448 bytes
SHA-256: b7ebf2763c70f6aeead6f4c5516aeb84e45ddf5ecb60933cfd641a58ed678b91

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