Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49144c6cb17d776…

MALICIOUS

PDF

67.7 KB Created: 2021-05-24 08:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eb61a1926493fb648ccc7f4eaf3e369d SHA-1: 11a80e743aa2cca157aa324e82760289c5c982bc SHA-256: a49144c6cb17d7767357a74097e9b4d08d7e3761fc9686409f523f7572b85c88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://zajinet.ru/strik?utm_term=prepare+to+be+tortured+audible PDF link annotation
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/dadukupulumugaxugu.pdfIn PDF document text
    • https://zamamuxito.weebly.com/uploads/1/3/4/2/134234866/gudesevige-mesuwuguje-raxujositufuboj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467019/normal_6004a16b4cdb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388841/normal_603cb533db64d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494147/normal_600bbf5383865.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495392/normal_60012a6d1bc8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_6029ea3e871b2.pdfIn PDF document text
    • https://xofofafe.weebly.com/uploads/1/3/1/4/131438501/gazuxodixezuru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415068/normal_6042007f5e50f.pdfIn PDF document text
    • https://pezufefak.weebly.com/uploads/1/3/4/8/134865979/c7710354a213fc4.pdfIn PDF document text
    • https://kobamaputoruv.weebly.com/uploads/1/3/1/4/131409310/malijatiwaxisipixudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443578/normal_60337bf31a3ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393785/normal_60393844833fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_6010d06b71c1a.pdfIn PDF document text
    • https://vemekejafor.weebly.com/uploads/1/3/4/0/134012611/5953274.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/sentence_structure_worksheets_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7234369-3a53-464e-8a26-dc2e7d62e0aa/kutorikekim.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/davis_drug_guide_app_review.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/resistor_color_code_mnemonic_racist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/935b764d-c580-46d0-850e-f7ebe1bf49b2/27004867872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7cf2038-d0db-4a3d-bdee-3a1db3276dd6/bash_check_shell_options.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eecedad-4fd6-49b3-ae03-1ab33b083bb4/94884603555.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/neil_gaiman_dc_comics_crossword.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_off0000cc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6A 4916 bytes
SHA-256: a1b7890bce93c22ce9204c71a969a78cd011331cae8575befb0490deb95edba6
font_01_sfnt_off0000dd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 10712 bytes
SHA-256: dea9dcabaa14b43cc4d4c4ae36ceb3431686d200d7726178af43dc1006b02919