Malicious PDF — malware analysis report

Static analysis result for SHA-256 3177732e9e81daf9…

MALICIOUS

PDF

78.0 KB Created: 2021-03-14 18:48:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3389173174394acdd1f8e2ef7514394 SHA-1: 1fd99023f483408a4aaa03e971014825fbd9d30f SHA-256: 3177732e9e81daf9b0f4838411875893782e9137fe61166a323060978cdf9d1c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=in+the+heart+of+the+sea+film+trailer
    • https://cdn-cms.f-static.net/uploads/4453329/normal_5fe8a904dee90.pdf
    • https://cdn-cms.f-static.net/uploads/4367287/normal_60473a4b4979a.pdf
    • https://cdn-cms.f-static.net/uploads/4421336/normal_60447999e4fb7.pdf
    • https://static.s123-cdn-static.com/uploads/4366365/normal_5fe30afda9cf9.pdf
    • http://everydayy.fun/bittersweet_book2f2bf.pdf
    • https://cdn-cms.f-static.net/uploads/4382793/normal_601fd2e3aae6f.pdf
    • http://gezinuloxi.22web.org/does_amana_still_make_microwave_ovens.pdf
    • https://cdn-cms.f-static.net/uploads/4418197/normal_600f60580e82d.pdf
    • https://static.s123-cdn-static.com/uploads/4470553/normal_5fffce1ca81b1.pdf
    • http://lnstagramcopyrighthelps.com/ramidelavekebazelikwq0b.pdf
    • http://awpmode.com/2031097915ld4dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_238f2a03ce684cad999f805bd4859110.pdf?index=true
    • https://s3.amazonaws.com/gajakelegeza/pezarikitumomipinoma.pdf
    • http://tuwemipidepu.epizy.com/defeme.pdf
    • https://s3.amazonaws.com/tosego/sasugewajosad.pdf
    • https://s3.amazonaws.com/kitakilesa/hoover_spinscrub_50_upholstery_attachment_storage.pdf
    • http://nimobavaze.epizy.com/dotidegiwenadovimidume.pdf
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_62f7871aaefd4a4c930cd1a30db66864.pdf?index=true
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_747d510c6dcb426699735140cf284756.pdf?index=true
    • https://s3.amazonaws.com/vaxebisapesi/whatsapp_karna_hai_video_calling_wala.pdf
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_b8e10257c94c49c9a043161aa08eb3db.pdf?index=true
    • https://s3.amazonaws.com/pidufozu/envision_algebra_1_answer_key.pdf
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_061e9cc6475144d0b6afba4a593e4de7.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_off0000f0f2.bin
ad8663daae7120ee1b3cf821d3e2a91e1155e4b138c66a7a86e7eed7ff94cc58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 4944 bytes
font_01_sfnt_off00010195.bin
d81f608ff08c3f77220cd601a850bb35f65a76929c2ff6a3ed4b8711a56c081d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 11688 bytes

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