Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc099aba043d297…

MALICIOUS

PDF

73.5 KB Created: 2021-03-15 02:58:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fc6d8da8574565c295a0b9e8102dcf40 SHA-1: a42780dbb20743930d60ceff2537dac384f6328b SHA-256: 3fc099aba043d2976390871bf10610ea36fff0defe946acdae4c055c756883ea
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links pointing to various PDF files hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary purpose appears to be directing users to external content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=how+to+mop+hardwood+floors+with+pine+sol PDF link annotation
    • https://rujijixagav.weebly.com/uploads/1/3/1/3/131383475/ebbae354445741.pdfIn PDF document text
    • https://xixozikitep.weebly.com/uploads/1/3/4/0/134097223/retuvimoxebugow.pdfIn PDF document text
    • https://xaziribubeka.weebly.com/uploads/1/3/4/3/134397614/72922273.pdfIn PDF document text
    • http://agreevudb.rest/showdown_at_canossaqg0bq.pdfIn PDF document text
    • https://fuwewarudizikip.weebly.com/uploads/1/3/4/6/134644733/pivebilojivaka.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/xaletugifudisow7kks.pdfIn PDF document text
    • https://mimifutugeteze.weebly.com/uploads/1/3/0/8/130874087/joguduvoje-kalasawivoma.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/fvTdHgc/chata_tatranska_strba_predaj.pdfIn PDF document text
    • https://sinupumu.weebly.com/uploads/1/3/4/8/134893056/b99b669.pdfIn PDF document text
    • https://bopevifobomamak.weebly.com/uploads/1/3/0/8/130814579/xabalikesabutevipu.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/f7MRYPK/dragon_war_boom_tycoon_mod.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/dumalapi-votefitunexawa.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/FSibxid/64655017679.pdfIn PDF document text
    • http://instapriz24.online/fenirifot9mak.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/701d1.pdfIn PDF document text
    • https://gewilowada.weebly.com/uploads/1/3/0/7/130776716/zinexotiwubojapi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 5336 bytes
SHA-256: 7ecf6ebc44e2aec6e678b560e958404e2b76bf0d7613b5df14ca945dacff3bcd
font_01_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 10720 bytes
SHA-256: 19dce15fe364d33eb6594fa85ab4f5cd3e4ca8434913863861edbd72e779fbc6

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