Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a476952a06c96f…

MALICIOUS

PDF

79.7 KB Created: 2021-06-06 01:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a6e826005b1ee53d1a2c600e0892f8f7 SHA-1: 9256fdda85de32f1b5b19e9b1937d0543c070b62 SHA-256: 70a476952a06c96f14a306f418e34db7a965b529fd117ee42c3e045f65647003
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier scoring it as highly malicious. The document contains numerous embedded URLs, with one prominent example being https://pistant.ru/pbw, suggesting a phishing or malware distribution attempt. The presence of many links on disposable hosting and the use of UTM parameters indicate a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://pistant.ru/pbw?utm_term=how+to+set+ken+tech+atomic+clock PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4487409/normal_60b1450063356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464862/normal_60017391a95f3.pdfIn PDF document text
    • https://pememeva.weebly.com/uploads/1/3/0/8/130874233/bidoxi_lewinepizame_biwilaminoxif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412775/normal_600fcbaa97c33.pdfIn PDF document text
    • https://xisigonok.weebly.com/uploads/1/3/4/7/134722575/zuzalemakev.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4444374/normal_60b1d5d70e811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490376/normal_5fd16f27d4d05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_5fd6449d168e9.pdfIn PDF document text
    • https://wumotobu.weebly.com/uploads/1/3/4/3/134370577/2096868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444852/normal_600ca28fb01a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499984/normal_6007a7f32f373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501214/normal_601bbe456b073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484807/normal_60498a1f34874.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5feb220d665f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484156/normal_5fd02caa936e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujolajoxek.pbworks.com/w/file/fetch/144529926/fibexamowi.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144611388/55495924821.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/f/how_to_open_cd_drive_on_dell_inspiron_3880.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/w/file/fetch/144465300/joluzes.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/how_to_install_cores_retroarch.pdfIn PDF document text
    • http://risodige.pbworks.com/w/file/fetch/144636780/canfitpro_theory_exam_answers.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_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 5060 bytes
SHA-256: 9dd922eec6aab6a0f00d8b02ad4c984e444bf5aa75d6b564d3488e7ca6a895cd
font_01_sfnt_off00010ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED5 10376 bytes
SHA-256: 5d1909d7b0440ee9e88ae996ac34116a6fa5e85191cbf44b1fa2c323c4002a75