Malicious PDF — malware analysis report

Static analysis result for SHA-256 651f813d6751c24e…

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 20:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 650fd207ead578202a589818d99df1c6 SHA-1: 9eac09101e875c1bb84de8c35f2197a6fbe1ac8f SHA-256: 651f813d6751c24e21d8b9e80b36b0fe19bc9b2ec23ae0969c0d92ae597081b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, with one specific URL pointing to a potentially malicious PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=the+conjuring+3+full+movie+free+123movies PDF link annotation
    • https://giasidaily.com/uploads/userfiles/file/vonujamozajoliwilogev.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/08/file/zerimuwagutebuboridad.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/bebezuzuwake.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/dazogalikut.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/76681060533.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/jubusigaxilenijuxubija.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/bajevodoxixuxebuwek.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/66072194141.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/bixaz.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/sekowekaxapowejupiluv.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/fulepu.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/31509060595.pdfIn PDF document text
    • http://masonhn.com/d/files/nimesiz.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/ridufesekipusufuz.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/95366643714.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/varoremotikumumo.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/15067097085.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/65721473682.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/darux.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/tireforaviwujanaz.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/35760064487.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ae340e09d3b283e371c97cdebfe34f02/45306871070.pdfIn PDF document text
    • http://fteq.ru/files/file/72864171441.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/mabebunaradezuzi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 11124 bytes
SHA-256: 4ecfce8a8919184bb104d18d93bc1aa8420171a5ce4514d97181f0bbe101185d
font_01_sfnt_off00010620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 19400 bytes
SHA-256: ea3256bb375f995863a3b780fce9c47404e4739034d3186d6c84b0bc6fe2c528
font_02_sfnt_off00013968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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