Malicious PDF — malware analysis report

Static analysis result for SHA-256 29bac6b5b55745f6…

MALICIOUS

PDF

70.2 KB Created: 2021-03-18 02:54:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6c3c12dcf91cb07ad6768e910186b76c SHA-1: b0120068387277c9ad5e5de3a52303cb494161c4 SHA-256: 29bac6b5b55745f6f0e5b22e2ce3c497c0948407bae4b4b763bfa53547f898d8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, and contains a large number of external links. The document body, though partially corrupted, suggests a lure related to 'Tzumi selfie stick charging instructions'. The primary function appears to be acting as a link farm, redirecting users to various potentially malicious or SEO-spam content hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://nipisod.ru/wix?keyword=tzumi+selfie+stick+charging+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447878/normal_600ea36a23893.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501965/normal_5ff249d716825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_601f29451e28f.pdfIn PDF document text
    • https://fazolusafiwef.weebly.com/uploads/1/3/4/5/134585025/fepizu_kibaxi_xuxidak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_6048979c678da.pdfIn PDF document text
    • https://xokutasaw.weebly.com/uploads/1/3/4/8/134883333/3187032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408323/normal_600c0061799e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5ff608c221de1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_60287d15815c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_60152cec48fe2.pdfIn PDF document text
    • https://tidevaxapoled.weebly.com/uploads/1/3/5/9/135971763/4448636.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_9083f2b8a3174322bfb692e97901fc6b.pdf?index=trueIn PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_cb6bdd27d32246b7a729a3b034385af0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7924a351-ce04-4a88-8e19-8a9bfbaca3d2/oracle_sql_loader_tutorial_for_beginners.pdfIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_78dd0575e69546b29850267824a92d5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/48524750464.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/find_a_sonic_restaurant_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d413f548-49fc-40ea-9534-825fdfb0573c/battletech_video_game_guide.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_off0000d26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 5356 bytes
SHA-256: c47889fbee2d9442d74221eb912e2d90688fea1eefbd58fcd9d1cbc9d4445a03
font_01_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 11056 bytes
SHA-256: 2042930cbf1dbf1f350b5c33f20ff56c20a7556f11120f337ca07a61e08595bd

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