Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac6b55fe291f19e…

MALICIOUS

PDF

93.7 KB Created: 2021-10-05 17:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ea899b2459fcef08f4a4beddbf46b4c2 SHA-1: bcb536c5fd1b17e08e1e05a8a6a0533832141714 SHA-256: 2ac6b55fe291f19e4783e27ebcc79f54d8dcc2e6085d72f565b0eea44dca7415
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=sql+injection+sqlite+cheat+sheet PDF link annotation
    • http://pantryscan.com/123cars/imagefck/file/18220933900.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/gokukifakinodabowuji.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/64805320124.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/67673087669.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/12498416501.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/vegemer.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/dutugejefowapagakumobafe.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lokerovudefised.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/36543526947.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/54736268155.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/98931201531.pdfIn PDF document text
    • http://spakimthi.com/upload/files/remoxe.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/16157337165.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa1f5e77ec---15892766479.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/6641971193.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140e61148d58---52979258263.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/53054611653.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/wixan.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/mosimulesexabavob.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/fulipodamigeruga.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/zukinakudapokozozumikilo.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/24593364998.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_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 10576 bytes
SHA-256: 9a3bf701005ae73ac609a4fe17d042503007316703cc8a3d7e2d13d73e6a0815
font_01_sfnt_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 22228 bytes
SHA-256: 6f9c9f00936e14b228ad49d8265e2831008e05162d70ab76fb6d6b7797ae73c3
font_02_sfnt_off00014fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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