Malicious PDF — malware analysis report

Static analysis result for SHA-256 630d8df7ca862e71…

MALICIOUS

PDF

106.8 KB Created: 2021-04-06 05:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 207c2c1bbb22a84254a8f4b99546d17d SHA-1: 9ab5576b0c4b1a63d316f4db61f9bdeb67fd6e49 SHA-256: 630d8df7ca862e714be8312da5ee73c255a59c9883a7dfa4afefbbe83dfb8c07
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, and the presence of external URIs further supports this. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://resalured.ru/123?utm_term=aparato+respiratorio+fisiologia+pdf
    • https://cdn.sqhk.co/bujomuvi/0cgfhhB/smash_bros_characters_2020.pdf
    • https://cdn.sqhk.co/vizelupavew/gfbjbjd/23455025918.pdf
    • https://pumijisiror.weebly.com/uploads/1/3/1/3/131381241/016c6f807f9bb.pdf
    • https://lupuwivutegela.weebly.com/uploads/1/3/4/1/134109151/bc0cbc03dfd9e86.pdf
    • https://fijapirugonobi.weebly.com/uploads/1/3/4/3/134315317/2917176.pdf
    • https://kiwotatuna.weebly.com/uploads/1/3/1/8/131856308/muvevetaki.pdf
    • https://kixarazebeda.weebly.com/uploads/1/3/0/7/130776474/vexuwiwizakejik_xawazu_delulipimuxama_zuneratuk.pdf
    • https://cdn.sqhk.co/vofudejobif/gfih7No/98046408874.pdf
    • https://cdn.sqhk.co/zigotimuti/Ef3ujcF/loxixurubos.pdf
    • https://vuwisirikufav.weebly.com/uploads/1/3/4/7/134765545/fbba3e57.pdf
    • http://bigakeka.iblogger.org/tas_united_answering_service.pdf
    • https://pubotaxo.weebly.com/uploads/1/3/5/9/135962756/radakaf_gexatuzibolusud.pdf
    • https://cdn.sqhk.co/fabukujeb/gjjbjiq/volopagoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fadadedezeker/lasefutiponebopobu.pdf
    • http://revenunazikun.rf.gd/rotezesigodejovewizi.pdf
    • https://s3.amazonaws.com/zemunomipazikez/65280316492.pdf
    • https://s3.amazonaws.com/wikurixobelu/dukekolapegix.pdf
    • https://s3.amazonaws.com/bededuxotulapil/10230026092.pdf
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_cd020fa0ec2c4186bae0ae6422ce3e19.pdf?index=true
    • https://s3.amazonaws.com/vovopafubipu/female_body_language_signs_of_attraction.pdf
    • http://tibepaxun.rf.gd/36727154493.pdf
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_6b9a0bf2a2f54e31b92a18b90dc198dc.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001617e.bin
dbc9b5add497abcbf570a1275635e1e48a97ad0228da3376b288f8b7949bf79a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1617E 5200 bytes
font_01_sfnt_off0001733c.bin
0c31db6fc529ce5db4fc338502a7070fcc11fdd362809226bd528fecc4c73251		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1733C 12468 bytes

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