Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d7cabc522bd9d4…

MALICIOUS

PDF

79.2 KB Created: 2021-04-16 13:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2f68aa3e8a24ea90a831901247369a7 SHA-1: 74d8a6295deaa4e0cf88b3d76ddbe101f1f20a1d SHA-256: a0d7cabc522bd9d4b623f340212c1fd3fd200427bba28ed99e00bd722cb0b0cc
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://seumenha.ru/strik?utm_term=how+to+create+drum+beats', likely serve as lures to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to redirect users to malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=how+to+create+drum+beats
    • http://jumpfs.space/baco_exu_do_blues_bluesman_albumpghdr.pdf
    • http://fitdieta.com/banded_iron_formations_definitionq19gq.pdf
    • http://idealicacolumbia.site/adobe_acrobat_freeware_for_windows_7eb2ot.pdf
    • https://femuketidoxesi.weebly.com/uploads/1/3/3/9/133997502/xanoreteda-xifatibavin-vapafopepu-difurotowanan.pdf
    • http://duwosolutanuz.mypressonline.com/beekeeping_books.pdf
    • http://dowedunazab.iblogger.org/libro_de_cantos_camino_neocatecumenal.pdf
    • http://lazategomid.scienceontheweb.net/14485115393.pdf
    • http://legendnat.space/business_report_format_mlazuj1n.pdf
    • https://sepuvoguzunisam.weebly.com/uploads/1/3/4/4/134488558/a66dbf46f1675bd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jujojomojemiz/94709535700.pdf
    • http://desovizipelo.onlinewebshop.net/shanghai_subway_map_2020.pdf
    • http://limuzer.atwebpages.com/xudofelunun.pdf
    • http://nizowozutagele.atwebpages.com/ejercicios_de_numeros_romanos_resueltos.pdf
    • http://rafodize.rf.gd/bikhre_moti_book_in_urdu.pdf
    • https://s3.amazonaws.com/wizitifowubux/asce_compaction_grouting_consensus_guide.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa37.bin
16273885b32e6502edc4055feb5d8ecb24e99045617ff5e20882bdfcc14af44e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 5248 bytes
font_01_sfnt_off00010c03.bin
be932a6aa9582d46d855263230ce1b5f782f76ff79003bf165032937083e0aec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 10584 bytes

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