Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe56fd4402be986…

MALICIOUS

PDF

110.5 KB Created: 2021-04-14 03:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd61ee973dae957a671b2edebffcf9ca SHA-1: cd2898eb345519ac0dcf19918b0b9cc978051a13 SHA-256: 0fe56fd4402be9867ac39528ad1d0500d14e74107ab12adb9243de907532487f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or SEO spam. The primary malicious URL identified is https://mezovuduw.ru/strik, which is likely used to redirect users to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/strik?utm_term=lazarillo+de+tormes+resumen+corto+por+tratados
    • https://cdn-cms.f-static.net/uploads/4492555/normal_600dabfdd695c.pdf
    • https://cdn-cms.f-static.net/uploads/4421768/normal_60243dea585ca.pdf
    • https://cdn-cms.f-static.net/uploads/4374537/normal_602378d2be56f.pdf
    • http://pasozabijegigus.iblogger.org/sign_in_sheet_printable.pdf
    • https://biwimukapol.weebly.com/uploads/1/3/1/3/131398517/8904799.pdf
    • https://cdn-cms.f-static.net/uploads/4463272/normal_6068f986686cd.pdf
    • https://cdn-cms.f-static.net/uploads/4407057/normal_5fd8169d6e811.pdf
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/nurulowegikug-rotopamezeb-pafuso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_62d12289cc43481f937bb38dfc75aa35.pdf?index=true
    • http://manisamat.epizy.com/deronogewetan.pdf
    • https://s3.amazonaws.com/vudivuzakal/what_is_the_nativist_theory_of_language_development.pdf
    • http://gapexer.rf.gd/asphalt_plant_manual.pdf
    • https://s3.amazonaws.com/sedowedi/xurabisaburikib.pdf
    • http://ruvotavigep.rf.gd/lipid_absorption.pdf
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_2d9d423e5b1246379098875b69ea8767.pdf?index=true
    • https://s3.amazonaws.com/zafirawit/atoms_elements_and_molecules_warm_up_answers.pdf
    • http://xewenofos.epizy.com/jibemevazaseze.pdf
    • https://s3.amazonaws.com/jagux/3066985297.pdf
    • http://zezazemana.epizy.com/how_to_use_vlookup_formula.pdf
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_6e5033b390b847419144fd3213678b4e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016478.bin
74b667488bd72212cb8726e82ff2160ab7ac83b7421cb7cfa773621aa08256b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16478 5092 bytes
font_01_sfnt_off000175b6.bin
462d0f6432d4db2a6f0977cd0ac59d6be6679a72dc63094b5f711d36570259f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x175B6 11900 bytes
font_02_sfnt_off00019c15.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19C15 4324 bytes

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