Malicious PDF — malware analysis report

Static analysis result for SHA-256 342c1c454fc0dcf0…

MALICIOUS

PDF

86.8 KB Created: 2021-02-19 08:59:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d3397baa37a9d5ac433db8f11611c22b SHA-1: 4462db26e1d0384a1c22b7661dd0f48e96a439db SHA-256: 342c1c454fc0dcf0333ff97b4faff16322361068bb239a39c5252d86521eb5d6
126 Risk Score

Malware Insights

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

The PDF sample contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external URLs suggests a potential for distributing further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://druttle.ru/123?utm_term=el+caballo+de+troya+fue+real PDF link annotation
    • https://dofufegudi.weebly.com/uploads/1/3/1/3/131381881/2410091.pdfIn PDF document text
    • https://lukuxafibufogi.weebly.com/uploads/1/3/5/4/135400428/2952407.pdfIn PDF document text
    • https://zojovotonoturur.weebly.com/uploads/1/3/5/3/135348007/ripoteve_zukajajid.pdfIn PDF document text
    • https://tepupareta.weebly.com/uploads/1/3/0/8/130814680/lujufal.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/4783748.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/pibKjjX/road_of_kings_endless_glory_review.pdfIn PDF document text
    • https://baraxuworasexe.weebly.com/uploads/1/3/4/6/134633060/widesebirizuz.pdfIn PDF document text
    • https://sarogixi.weebly.com/uploads/1/3/0/8/130813770/6805817.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/gche91R/lebobazevavapedosa.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/tCKhetx/davutobezanuwasomeva.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/fXic8ii/1487230602.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/2LifMOh/giant_stress_ball_kmart.pdfIn PDF document text
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/7132e7.pdfIn PDF document text
    • http://discovljzg.fun/romantic_mbti_compatibility_chart7bzxl.pdfIn PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/fowoj.pdfIn PDF document text
    • http://vinograd.io/wilotodezivusubilumogao0rue.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_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 5036 bytes
SHA-256: 3ecc7c58aca56e6842403a3740ead7a05cae77155fc4609228d44a0a57e01431
font_01_sfnt_off000127d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D4 11832 bytes
SHA-256: ea24f7c95ea2b8150671950dbe2fb84ebc377511e217cf83a5b87fb02e58b1b0

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