Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2784461c61ebbd…

MALICIOUS

PDF

77.7 KB Created: 2021-04-14 06:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79577bf6668d37af06acc15efcedbb36 SHA-1: d281c06a83c4c92ddf95acd125bbeeadd90c9272 SHA-256: 1b2784461c61ebbd003a345e757057feabf8007ef53b144b88d8cdfdd4e86bb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm or phishing campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. The embedded URLs, such as https://pelibifir.ru/strik, are likely used to redirect users to malicious sites.

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://pelibifir.ru/strik?utm_term=painting+cabinets+diy+youtube
    • https://cdn.sqhk.co/xogodapap/hfgfhg5/duxufonetukasogosalezaf.pdf
    • https://gujuxufun.weebly.com/uploads/1/3/5/3/135398829/miduvuzebazuj_puradakulipano.pdf
    • http://xufopizaxeto.medianewsonline.com/basic_circuit_symbols.pdf
    • https://static.s123-cdn-static.com/uploads/4406820/normal_5fecc7440ee67.pdf
    • https://static.s123-cdn-static.com/uploads/4419633/normal_6004f6ad254ff.pdf
    • http://nilutafejo.mypressonline.com/acv_arteria_cerebral_media.pdf
    • https://cdn-cms.f-static.net/uploads/4468823/normal_603afa03ae3ff.pdf
    • https://lerasakob.weebly.com/uploads/1/3/2/6/132682990/mafunufisewikozok.pdf
    • http://mogimetekojubar.scienceontheweb.net/buguridimuwobeduxujo.pdf
    • https://cdn.sqhk.co/vudebalox/chaT7gi/iscuela_connect_parent_app_download.pdf
    • https://goguribepolim.weebly.com/uploads/1/3/0/7/130739596/saban_tusilaxu_jaberuzafolala_roxetobagunas.pdf
    • https://cdn.sqhk.co/fuluzezufe/qicgfhg/50670931305.pdf
    • https://rugakimi.weebly.com/uploads/1/3/5/3/135323030/luvividogunonel.pdf
    • https://static.s123-cdn-static.com/uploads/4493266/normal_5fec1a410ce4b.pdf
    • https://momimuraw.weebly.com/uploads/1/3/1/3/131384495/f16f700dd9d.pdf
    • http://fidafevemikiwe.mywebcommunity.org/nunepozorodojukupezelog.pdf
    • https://cdn.sqhk.co/luwesefizi/iciaCjj/xojidunepo.pdf
    • https://zovejesuvenej.weebly.com/uploads/1/3/1/4/131438366/f0c472d9.pdf
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/5b80d14e7c5d6.pdf
    • https://cdn-cms.f-static.net/uploads/4381988/normal_605e1127ed710.pdf
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/01e06cfd50.pdf
    • https://cdn.sqhk.co/lojadisexudo/hhdhi36/global_warming_earth_science_definition.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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_off0000e71d.bin
947f4c4de71b5e4e2b5135d7352865fb53c7f9f257a5f9adf27606902e2cc3c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 5104 bytes
font_01_sfnt_off0000f884.bin
5234947aa2774efd3d961945bb1cc94ea552bf9bf774aaaf002713655f3f7fea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 10152 bytes
font_02_sfnt_off00011b4d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4D 4324 bytes

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