Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c130a4451cdc5d…

MALICIOUS

PDF

84.9 KB Created: 2021-02-02 00:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c8e13cf270ba2bd4f55b008a278e5d21 SHA-1: 6a79d6fbf42339bfc13cae5f60bd7d6cf925611f SHA-256: c3c130a4451cdc5daa76b489b3606ff4e8dea18a325a0123dfae8be1d0c878ac
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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/123?utm_term=super+speed+math+pdf PDF link annotation
    • https://gepogixuzusesil.weebly.com/uploads/1/3/3/9/133999736/6833030.pdfIn PDF document text
    • https://cdn.sqhk.co/romafime/iiP5Hic/88252112120.pdfIn PDF document text
    • https://zatibuvox.weebly.com/uploads/1/3/0/7/130738619/8847440.pdfIn PDF document text
    • http://waxinexedodupij.22web.org/extravasation_guidelines_2016.pdfIn PDF document text
    • http://spindlndou.space/rabojoruvizonafezipaziket88q47.pdfIn PDF document text
    • https://cdn.sqhk.co/kusonemap/jhhfnaK/nintendo_3ds_puzzle_games.pdfIn PDF document text
    • https://makumanufomogo.weebly.com/uploads/1/3/0/8/130874647/tejas.pdfIn PDF document text
    • https://cdn.sqhk.co/pugalaleluti/jigg264/rezugorenek.pdfIn PDF document text
    • https://rulakufip.weebly.com/uploads/1/3/4/4/134489053/5483539.pdfIn PDF document text
    • http://ecoservice-vlad.ru/moxemurisowubu4u1uj.pdfIn PDF document text
    • http://contentmedialiteracy.com/java_programming_downloadpmi73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477638/normal_60017cf14dc32.pdfIn PDF document text
    • https://cdn.sqhk.co/wukikanas/slhjjeT/92430542549.pdfIn PDF document text
    • https://tapogizixe.weebly.com/uploads/1/3/4/8/134897788/34fc7c9004c.pdfIn PDF document text
    • http://vakexuk.22web.org/formal_black_tie_affair_meaning.pdfIn PDF document text
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/simigubifota_zutoputiponot_navipoverepep.pdfIn PDF document text
    • http://idealicaitalia-official.site/67030888595pcq8g.pdfIn PDF document text
    • http://metalllift.ru/carol_ann_duffy_biography4ff9x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5feb94a27edf4.pdfIn PDF document text
    • https://vixugusimuxomuj.weebly.com/uploads/1/3/0/9/130969476/subis.pdfIn PDF document text
    • https://zunejafeg.weebly.com/uploads/1/3/4/3/134382709/e3ad3a505fc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidexegope.epizy.com/soxegewuratugonebiviwe.pdfIn PDF document text
    • http://bakenexiradofo.epizy.com/catmint_plants_information.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C07 5352 bytes
SHA-256: 5b7e97fff461dcd704ff218ea8300a7edda5280a32690e41b1a20c39dfcc9c11
font_01_sfnt_off00011e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 11948 bytes
SHA-256: 11139dd562969072bb694f13575418c57f0447437db80a0891c68744af7e997b

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