Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f9f038b2617e01…

MALICIOUS

PDF

139.5 KB Created: 2021-03-23 22:31:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 031c490980937cf4f1673f228def68fa SHA-1: dd07b9ccccc7fd649a6191e76cfe7ec95ee74262 SHA-256: a2f9f038b2617e01593f4c21072b57f8d20ea75f8e9361785918bdc873a65e6b
196 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for phishing and SEO link farms. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' indicates the document's content is designed to deceive users, likely by masquerading as a legitimate schedule to encourage clicks. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://nipisod.ru/wix?keyword=ridgevue+high+school+football+schedule
    • https://cdn.sqhk.co/timugulirebu/EigRE9t/bombshell_perfume_set.pdf
    • https://cdn.sqhk.co/jakufomego/WL0Eu1l/2052263901.pdf
    • https://cdn.sqhk.co/risenulowo/lqjg2OB/93313604885.pdf
    • https://cdn.sqhk.co/wagavoketi/dIZhjL3/signal_private_messenger_pro_apk.pdf
    • https://witomoniwitu.weebly.com/uploads/1/3/5/3/135317652/vatofivivajuwemilate.pdf
    • https://cdn.sqhk.co/baresupujar/YThcFLJ/60204348728.pdf
    • https://cdn.sqhk.co/letonolomo/dfhbjgh/vomiting_blood_liver_disease.pdf
    • https://tezagezowuvese.weebly.com/uploads/1/3/0/7/130775310/1890312.pdf
    • https://gozopurejogutix.weebly.com/uploads/1/3/4/5/134578339/lusiliwuporapojod.pdf
    • https://xefomivor.weebly.com/uploads/1/3/0/8/130814633/basakomu-nunireluwudoj-tutikojug-faxenib.pdf
    • https://cdn.sqhk.co/tumowara/ijwnihX/nubabez.pdf
    • https://cdn.sqhk.co/lakekomum/1qjfifZ/squad_conflicts_offline.pdf
    • https://cdn.sqhk.co/radofufalam/bljfjgF/63337898995.pdf
    • https://zoxujaratufopa.weebly.com/uploads/1/3/5/3/135399722/9529212.pdf
    • https://visofamawuri.weebly.com/uploads/1/3/2/3/132303269/5597361.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/metubevozisul/zaterinum.pdf
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_d3a77ec029b64cc8a3438954f10b7c1f.pdf?index=true
    • https://s3.amazonaws.com/xarojapi/nizejomaxasof.pdf
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_75ba0ec7fcfa4404aa7dcee0101edcab.pdf?index=true
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_7f9f38b5dbf94795a78f89c2c5a2c24d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e565.bin
61bb7e7c3dde6c54fcb1bff163f656a596fd02c6cc73b36f6c2e16b0e8ddc120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E565 5396 bytes
font_01_sfnt_off0001f7d1.bin
f7da4ffad6b9f95fd0657f434415cba19e8644fe2dfea11b65b08253d786723d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7D1 12540 bytes

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