Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b26f709955719b8…

MALICIOUS

PDF

69.9 KB Created: 2021-02-17 04:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9b04454049cdc8d69646cc127ec157ca SHA-1: 351c22f3c46b18324673c573abf6b3aed940c05b SHA-256: 2b26f709955719b8e15f80955388ca757e638f397987619f52eda5fce47884a4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/wix?keyword=android+6.0+download+apk+zip PDF link annotation
    • http://liolika-rsya.ru/tissot_t_touch_user_manualwdzvz.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/6ghia7H/how_to_increase_screen_timeout_in_iphone_6s.pdfIn PDF document text
    • https://woduluzotuni.weebly.com/uploads/1/3/4/3/134373450/faraxunanatora.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/bg2jhfq/determine_wheel_size_for_bike_computer.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/3469676483349c0.pdfIn PDF document text
    • http://heartcenteredequestrian.com/sozejegojulezajoregibomfrt.pdfIn PDF document text
    • http://alexsaf.ru/android_dialog_blur_backgroundkt0s1.pdfIn PDF document text
    • http://swiss-gear.shop/mijugurov57un.pdfIn PDF document text
    • https://cdn.sqhk.co/dalegoti/ahbgjVO/23501785880.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/ighcDji/63142191752.pdfIn PDF document text
    • http://apple-fruit.space/reading_skills_activitiesfmfg5.pdfIn PDF document text
    • https://cdn.sqhk.co/nisisepolo/ijGjage/environmental_studies_vs_environmental_science.pdfIn PDF document text
    • http://trysoda.pro/manual_handling_risk_assessment_template6kqj9.pdfIn PDF document text
    • http://mx50off.pro/guidelines_for_short_term_disability2ul5f.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_off0000d3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 5296 bytes
SHA-256: c2c19294c01ddcec223653d906e5755007987e0150db494d9198f5c05f0c2546
font_01_sfnt_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 10728 bytes
SHA-256: 6c38a74f06f4a2ffa86d869a615facd67435da09332fc0e1ae4eafcea2c407a3

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