Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87741d742c9320a…

MALICIOUS

PDF

76.1 KB Created: 2021-03-19 11:13:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ee7982bfa80fbe4f4e133405f17404f SHA-1: 2776702a69dbd20cf04fd5717f0da03c0d2f19d9 SHA-256: d87741d742c9320a2049a888cafab074b85d59d8241f437f72c900ce027abc16
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, with the primary malicious URL being https://pelibifir.ru/strik. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests an attempt to redirect users to potentially malicious content or phishing 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.
  • 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=air+force+1+high+top+kids
    • http://kepukarob.sportsontheweb.net/wekemowajafawej.pdf
    • https://cdn.sqhk.co/tokofape/yjfjeGf/windows_movie_maker_old_version.pdf
    • http://mishgen.com/eitim_psikolojisi_kpss_km_sorular_2017002ih.pdf
    • https://cdn.sqhk.co/zimuteraf/Ugetdii/wowalukogijetop.pdf
    • http://begetus11ppz.xyz/44811564073nry4a.pdf
    • http://pabulaluxe.iblogger.org/niziwule.pdf
    • http://visemomasa.66ghz.com/51745591613.pdf
    • http://nesobaka3.xyz/jozoxojobizuziruwvqgl4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/122ac5c9-0dd0-4ca1-88bd-670c55738325/18772287286.pdf
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_a7a77e5f28c84ee7ae5d9ca8de8c7355.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a7da8daf-04c5-4271-bb93-49e7cf06d006/22450090839.pdf
    • https://uploads.strikinglycdn.com/files/c0af6ca1-9f26-4077-b71e-3b9365386702/pezesasikitedoruxixi.pdf
    • http://rodobokojezaga.epizy.com/720652957.pdf
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_4d2b2bca57614a3f8b9a1728353c76ff.pdf?index=true
    • http://figobob.rf.gd/18971030874.pdf
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_b10207cf5fdb47279e2682c19c6649fa.pdf?index=true
    • http://gudujezakolomu.onlinewebshop.net/22443819313.pdf
    • https://uploads.strikinglycdn.com/files/e9c6916c-c510-4606-ad07-65c6bd4383bd/diccionario_ingles_espaol_larousse_descargar.pdf
    • https://uploads.strikinglycdn.com/files/c709f9b0-8cb7-4ef7-84bd-f5d309749d85/bovotivudovetitiredapijoj.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_off0000eb94.bin
da5c622dce224a919e55252f03a1e77e7a82ea0a9a0a1c02a9ae08d8e2473cd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 5280 bytes
font_01_sfnt_off0000fd9a.bin
59c34be35ab4d042809975673d206de53de157b3df4bd3101df07bbe8d190a6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 11608 bytes

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