Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0df0a94f9827e79…

MALICIOUS

PDF

64.8 KB Created: 2021-02-12 11:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 642471633cbed1bb8bc6b60cdd7adef5 SHA-1: e94ed6b2d37df3663c32ad8de01ab59586369e47 SHA-256: c0df0a94f9827e7961a8b88c58ccf0af279c70a6462316f214e9fc6ccaaa5281
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, containing numerous external URIs pointing to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic of using many low-quality links on disposable hosting, often associated with phishing or malware distribution. While no scripts were explicitly extracted, the presence of multiple external links suggests an attempt to redirect the user to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=quick+and+hot+ah-780+manual PDF link annotation
    • http://prodit.space/21321021529rwys0.pdfIn PDF document text
    • http://vigastlens.xyz/xofafnvh68.pdfIn PDF document text
    • http://wawovotem.22web.org/31464627311.pdfIn PDF document text
    • https://biwaxosele.weebly.com/uploads/1/3/1/4/131437294/xolowewu.pdfIn PDF document text
    • http://raftgjgr.space/tuxegata3xk42.pdfIn PDF document text
    • https://lelidejob.weebly.com/uploads/1/3/4/6/134643066/6486161.pdfIn PDF document text
    • http://zzzmmmmejjj.space/create_email_templates_for_gmailcccwa.pdfIn PDF document text
    • https://movalolutipala.weebly.com/uploads/1/3/2/6/132681002/92d9c5.pdfIn PDF document text
    • http://lalozakuren.66ghz.com/steam_restarted_to_0.pdfIn PDF document text
    • http://enots.space/arachnids_and_insects_dichotomous_key_answerssdczn.pdfIn PDF document text
    • http://world-wildshop.com/cthulhu_board_game689oq.pdfIn PDF document text
    • https://sozagigojo.weebly.com/uploads/1/3/1/4/131454883/4630795.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/masodepe.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12E 5240 bytes
SHA-256: a1623f26920141ac0df79c1550686a7b87ce6a2a517d05c72710747f7a994d16
font_01_sfnt_off0000c2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DC 10680 bytes
SHA-256: 3de2923f05b5c9fdfceeba94d3b93b0b76bb1ff4a6ed0d7a92d97bc7686f7295
font_02_sfnt_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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