Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5c68f66194f3cf…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 03:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 778907aa758a89db7db9671dc6961a4f SHA-1: 2c6b45deefd804986f2795e208a846bfb646c5bf SHA-256: 0c5c68f66194f3cf89b61c7ed5b95865c44d2fcdd413bb112ba337e5b2dabf96
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. Heuristics indicate it is a link farm and a callback phishing lure, suggesting the document's purpose is to trick users into calling a fraudulent support number. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing attempt.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://rzfmuhasebe.com/userfiles/file/kikudatoguputufumegaxofe.pdf In PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/2922774435.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/56051572450.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/7187067726.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210901_9BFE137937AE733F.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/98849547880.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/70255855179.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/43296829013.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/66318144998.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/14645004188.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/94543843137.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/sisukenojikuzujotixeriseg.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/gexexajiladaxajopip.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161336d50ac469---3088000744.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/27540576578.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///lajekodekuxosizekep.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/52654819058.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/zelivuzizonifu.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/29811498392.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/61375676220.pdfIn PDF document text
    • http://rld-carbon.ru/file/turajelikase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=chrome+extension+for+keyword+researchPDF 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_off0000d5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 18144 bytes
SHA-256: 9a805cbdded5b57017e1f5206a1eb8f4372bd3653c5c199500df72653c47db7b
font_02_sfnt_off00011d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 11120 bytes
SHA-256: 93809c56790712cde30145d7467de147d2959b734d50c61a6e284077bb282e82

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