Malicious PDF — malware analysis report

Static analysis result for SHA-256 1728ec50db1171a1…

MALICIOUS

PDF

80.0 KB Created: 2021-05-30 07:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9d3ffc17a691e0d6f8c874cc1ac06c6d SHA-1: b2987d5905fa26919b6e09be1feb858cc655dab4 SHA-256: 1728ec50db1171a15d2bf4c447e61c00acf2f762766381f93713143f517de317
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The primary URL identified is https://ponafet.ru/strik?utm_term=factors+and+divisibility, which is likely the destination for malicious activity. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://ponafet.ru/strik?utm_term=factors+and+divisibility PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443337/normal_6056a6ce2c150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_6017013ce3e4c.pdfIn PDF document text
    • https://puxefulido.weebly.com/uploads/1/3/1/3/131383426/6f444ae64bc66e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425238/normal_60033563e5ff3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473023/normal_5ff76cc0d30e9.pdfIn PDF document text
    • https://kixuvatapowow.weebly.com/uploads/1/3/1/3/131383305/gepuwivivak.pdfIn PDF document text
    • https://bibokesoxi.weebly.com/uploads/1/3/4/8/134850131/7536953.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460076/normal_5febb070154a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_60403f8c248da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498345/normal_5fd2f8ecbfd87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392652/normal_6028747de5419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466673/normal_5fe7e86541941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_6043bcc3281a2.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/dd7ced24-f064-462b-a774-db9b0f7154e6/how_much_does_brinks_truck_cost_to_repaint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b7ca69-db44-483d-b0ab-b6344e007e94/chapter_8_section_2_the_birth_of_political_parties.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b0a0c03-1fe9-48c2-9a3d-3341d83d9382/xikalazixerununel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca22bac-c623-4ad8-b042-85e9800fecf5/32565883202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d75111-5574-4284-a4a0-c27b66aff835/what_is_the_theme_of_the_tequila_worm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a0681ee-1588-461a-887a-339689f3cb44/61797003933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a468cfb8-23f3-4fef-bd60-01b525fa935c/pafiduvexoborefelagovexav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f12fd0-614d-4454-96aa-80d8868fc419/tebojepisimazifufes.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_off0000fc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8A 5188 bytes
SHA-256: 0d4ced2a18ade0d1f46e4eed72b1fa88b0f55ee02b2ceb7d44bf44e46baa7d97
font_01_sfnt_off00010e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 10764 bytes
SHA-256: 3cdff52f9711332ee1d9870041a20d08397662c07aec942a897da72072bd7ecb

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