Malicious PDF — malware analysis report

Static analysis result for SHA-256 031ffed71dbe5f57…

MALICIOUS

PDF

71.1 KB Created: 2021-02-23 21:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 5c4cfd77a87bec891a6e9ea9dc75fc1c SHA-1: 8d216478fdd463d5c3694c4cd2f076a6f0961f8a SHA-256: 031ffed71dbe5f57e1287057a49d6967a9d405b6be469c4d32be9f0604ebcfa8
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. The primary purpose appears to be redirecting users to potentially malicious content hosted on external sites.

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://bologen.ru/wix?keyword=guide+6502+cpn PDF link annotation
    • http://swiss-family.space/jetpack_joyride_download_apk_hackjeg4a.pdfIn PDF document text
    • https://ninefajesazaga.weebly.com/uploads/1/3/5/3/135384029/zosare.pdfIn PDF document text
    • https://rinezafuwokof.weebly.com/uploads/1/3/1/4/131437641/6304629.pdfIn PDF document text
    • http://bizbize-yeteriz.org/baldur_s_gate_enhanced_edition_portraits_packmts58.pdfIn PDF document text
    • https://mekowoto.weebly.com/uploads/1/3/0/7/130738632/3152981.pdfIn PDF document text
    • http://afracheat6.xyz/polar_and_nonpolar_solvents4rjnq.pdfIn PDF document text
    • https://wojuguzibuliru.weebly.com/uploads/1/3/4/8/134896427/7534436.pdfIn PDF document text
    • https://cdn.sqhk.co/palezubifo/hGmvgj0/tanesonixiwebomiwunawi.pdfIn PDF document text
    • https://bojuwakuxejekur.weebly.com/uploads/1/3/5/3/135347713/7251427.pdfIn PDF document text
    • http://bandalet.club/music_notes_treble_clef_worksheetweqlk.pdfIn PDF document text
    • http://cashtanks.fun/tuwugosanelbids.pdfIn PDF document text
    • https://jefaxuler.weebly.com/uploads/1/3/0/7/130775921/3f6e31a3a4eaf.pdfIn PDF document text
    • http://20970907.net/fable_3_strategy_guide6chw4.pdfIn PDF document text
    • https://vixawesomuwevu.weebly.com/uploads/1/3/5/3/135387162/7277905.pdfIn PDF document text
    • https://suwisabinupa.weebly.com/uploads/1/3/5/3/135351097/wamebi.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/hjdihgj/broadside_ballad_definition_literature.pdfIn PDF document text
    • https://cdn.sqhk.co/bofogarabu/cihrjj9/mopulomaderemip.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/lefemijip/ecommerce_websites_psd_templates_free.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_off0000cc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC73 4828 bytes
SHA-256: 45eb3dd29a7166876de680fddd3cba4fd35c5bc0d98f7b70b57c5374a4800bd7
font_01_sfnt_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 10780 bytes
SHA-256: 19d4a63bd695421b08e0234f8d363c293a77f1ecf51e2c480ee5feacb161513d
font_02_sfnt_off00010198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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