Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a63f88e7afcc14…

MALICIOUS

PDF

80.3 KB Created: 2021-03-14 08:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6eb03a5a6487fd69c700e61ebecd2118 SHA-1: 553dfbea6fdbc77880ab5331a347e8159de83c7d SHA-256: 90a63f88e7afcc148cf1a40a434b5e6bcefdd2607dd0758ca0c9cca466fd7626
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or link farm attack. It contains a large number of external links, with the primary URL being 'https://maypoin.ru/award?keyword=breakthrough+advertising+book+pdf'. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious or SEO-manipulated content, potentially as a phishing lure or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=breakthrough+advertising+book+pdf
    • https://cdn-cms.f-static.net/uploads/4423443/normal_6028ea26aa1b2.pdf
    • https://wakowugiluto.weebly.com/uploads/1/3/5/4/135401031/1557565.pdf
    • https://vipefujalebir.weebly.com/uploads/1/3/4/7/134744486/leralifixemese_lupedod_petadu_lusujofovagi.pdf
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/5356980.pdf
    • https://tivositazevuzin.weebly.com/uploads/1/3/5/3/135349871/texiwiragik.pdf
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5feb18694d741.pdf
    • https://static.s123-cdn-static.com/uploads/4501046/normal_5fe27f226def2.pdf
    • https://rarinuda.weebly.com/uploads/1/3/5/3/135349313/fiwefune_kepiwe_fetarixo_vowipofe.pdf
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/1030828.pdf
    • https://nopuwilimo.weebly.com/uploads/1/3/4/4/134490360/lelupej.pdf
    • https://static.s123-cdn-static.com/uploads/4404969/normal_5ff9a91116cb8.pdf
    • https://static.s123-cdn-static.com/uploads/4464311/normal_6002093033942.pdf
    • https://static.s123-cdn-static.com/uploads/4425238/normal_6002fccf66be8.pdf
    • https://zakepanitug.weebly.com/uploads/1/3/5/9/135977879/e48b77565190.pdf
    • https://static.s123-cdn-static.com/uploads/4375700/normal_5feb8e2517b7e.pdf
    • https://wiwofuda.weebly.com/uploads/1/3/2/3/132303082/zijabo_rofasogut_getisoruzejix_zezarutamikogi.pdf
    • https://cdn-cms.f-static.net/uploads/4384143/normal_6013a196c2c96.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_ff464aa02e5b43be9260d8a68cf86066.pdf?index=true
    • https://s3.amazonaws.com/lolijexejomak/spotify_cracked_android.pdf
    • https://s3.amazonaws.com/gatazeromij/25942433750.pdf
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_7cb9edcecf6c413d916daef5f6378e83.pdf?index=true
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_1e35cd689a8245389fab6d07a7094e64.pdf?index=true
    • https://s3.amazonaws.com/voxipanovigepiv/life_fitness_95te_review.pdf
    • 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_off0000fbae.bin
2f3090a85fd8cd6acf6fcac01f4b8ced720c937641640e2b59d22b87be69073d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 5584 bytes
font_01_sfnt_off00010eb7.bin
ec127c039fb1aa5b0bb77fea75f2d4b3b6f7ec803bba330577c4f5be36f0e5b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB7 10844 bytes

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