Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fe221ab2bcfc8b…

MALICIOUS

PDF

75.6 KB Created: 2021-09-12 17:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5eae78d75fdcdf7970bc72fe9106f11e SHA-1: 3efee8834dd0f5073fd8a3abfe2fe0c741d1494d SHA-256: 79fe221ab2bcfc8b234a754e47b946a52e4e06b1335919f12a8924daf5f3f1a5
146 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous embedded URLs and the 'SE_CALLBACK_LURE' heuristic strongly suggest the intent is to trick the user into interacting with external links or calling a phone number, likely for fraudulent purposes. The numerous unknown reputation URLs are treated as potential IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://esebtekstil.com/resimler/files/14129039146.pdf
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/22611197532.pdf
    • http://shanghaiqingchen.com/upload/files/putedapigutofokemuvef.pdf
    • http://limobebe.com/userfiles/files/mixezabivexubafagutupoxu.pdf
    • http://movesearchesuk.com/userfiles/file/91794424627.pdf
    • http://edituj.cz/res/file/68093854672.pdf
    • http://geometracosentino.com/userfiles/files/winoxoxowamuvalov.pdf
    • http://nhatnamvina.vn/rich_editor/file/zisutus.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c483cecde4---27048889843.pdf
    • http://rentator.com/uploades/fckeditorfile/5424795939.pdf
    • https://harmony.im/userfiles/file/xipapaxugikepawo.pdf
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/74315994812.pdf
    • http://varadimasszazs.hu/uploads/files/45693174958.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210901_131807.pdf
    • http://soldearenales.com/galeria/files/talovuvifesofatijivi.pdf
    • https://mkycc4.com/kycc4.com/userfiles/files/24347088341.pdf
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/maluk.pdf
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210911192901.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366ff404019---xexakog.pdf
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210907211705.pdf
    • http://landpas.pl/upload/file/tileviwafozutigejofa.pdf
    • https://foodexgida.com/uploads/files/55328408221.pdf
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630770312_2f68ce48fb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=my+life+in+new+york+game+apk+download
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c01c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC01C 16792 bytes
font_01_sfnt_off0000d833.bin
fc69771db810d683fa6183331a14896fa3f1168a7717772c7fcfc60768452507		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 10860 bytes
font_02_sfnt_off0000f111.bin
73c141357ed7398a72d1878d4344f1a42c2517a9ac19f94e772269a7d9023a8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 18312 bytes

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