Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec4090fce60d2ad…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 05:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab7d5d4c393f30e601f966812e03046e SHA-1: 4b63990673be22d83b1229d023f8563d5eca86f1 SHA-256: cec4090fce60d2ad5e17e6bec4b369810b42d7276b2c8e0a47779a5f25d519c7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm for phishing lures. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content, likely through a phishing or invoice-themed lure as indicated by the SE_INVOICE_LURE heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://zdravi-kromeriz.cz/files/file/69301183738.pdf In PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/11194941833.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/76959795989.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/52458767439.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/xanenidipepudidadema.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/zimoxa.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/21733558293.pdfIn PDF document text
    • http://voijin.com/userfiles/files/volupodedademim.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/demeromasabi.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/67814783866.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/burop.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/kigupomixaraderike.pdfIn PDF document text
    • http://secretinvitation.net/images/files/26815830330.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2d444b2d981c9942908d22c45d6738eb/wogalepikonaz.pdfIn PDF document text
    • https://bataretak.com/img/files/file/jifuxu.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/14544828580.pdfIn PDF document text
    • http://coachhouse.info/assets/file/78028055496.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/raxemaxifer.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631366739.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/99mi5tifuauc21a5o2d8cp9i24/zedapenewalefumekizasor.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///74954061741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=office+365b+loginPDF link annotation
    • 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_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 16800 bytes
SHA-256: e9e66ee787be895d4ff617118dbf70c5f839fba23fc89198e54db35d3d5fd351
font_01_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001240a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240A 10620 bytes
SHA-256: 62df0c17d1ceb205eeabad749b6ad9d93812cfb27bdd5a7774660d18bebd9ec0

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