Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e419487b9d23c6c…

MALICIOUS

PDF

80.6 KB Created: 2021-05-13 19:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f836dc69ac47cd772c20fd0d68c1ab3e SHA-1: 76afdd5e2a1efe4288d294b2bc40e7182bfa2775 SHA-256: 7e419487b9d23c6c4fce9292f13769c2d66848545c50b77385f92a559bc764e8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically as a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/strik?utm_term=los+juegos+del+hambre+peliculas+similares
    • https://static.s123-cdn-static.com/uploads/4407991/normal_5ff8a7e8e39a2.pdf
    • https://static.s123-cdn-static.com/uploads/4393364/normal_5fe2287660076.pdf
    • https://cdn-cms.f-static.net/uploads/4466370/normal_6012fb7878684.pdf
    • https://cdn-cms.f-static.net/uploads/4495974/normal_606a7394dc37b.pdf
    • https://cdn.sqhk.co/wixumenez/Qgfhi7l/nice_describing_words_beginning_with_m.pdf
    • https://cdn-cms.f-static.net/uploads/4411686/normal_60462bf06e253.pdf
    • https://static.s123-cdn-static.com/uploads/4389794/normal_60078dedd747b.pdf
    • https://cdn-cms.f-static.net/uploads/4494440/normal_605266a44f55c.pdf
    • https://cdn.sqhk.co/tivanosox/f8hkfjb/kazitesemovoliralowiwem.pdf
    • https://cdn-cms.f-static.net/uploads/4426697/normal_603f30ac74266.pdf
    • http://zereteleriw.getenjoyment.net/pc_jain_paleontology.pdf
    • http://wotaxatumumodok.sportsontheweb.net/tartarato_de_brimonidina_bula.pdf
    • https://cdn-cms.f-static.net/uploads/4372377/normal_6039b303890ac.pdf
    • https://xijexarara.weebly.com/uploads/1/3/4/0/134017378/a86dd69.pdf
    • https://static.s123-cdn-static.com/uploads/4491965/normal_5fe357d62cd99.pdf
    • http://fojukivijivik.medianewsonline.com/todex.pdf
    • https://static.s123-cdn-static.com/uploads/4416321/normal_6001f007055c4.pdf
    • https://wupovejiti.weebly.com/uploads/1/3/2/8/132814541/4082927.pdf
    • https://cdn-cms.f-static.net/uploads/4501028/normal_60565332aa26d.pdf
    • https://cdn-cms.f-static.net/uploads/4406216/normal_604e2b9e6e784.pdf
    • https://cdn-cms.f-static.net/uploads/4462036/normal_603a579019c9c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://supajiwa.myartsonline.com/pigazevisekasenowase.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9e.bin
7ca6e9b55db09d51e484188fa0fd20a406dafbd1cb18efd9ac78763405f49a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 5340 bytes
font_01_sfnt_off000101bd.bin
de7c5192f50eec42b10907aac6bba65c6d5bb432570e0944daa3d9e62d76fc0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 11292 bytes
font_02_sfnt_off000126ab.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126AB 4324 bytes

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