Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a370c7a7d89d79…

MALICIOUS

PDF

71.8 KB Created: 2021-09-22 22:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0f7a74c3e4dc9ba06a7091fef8a2385 SHA-1: c1e52096c55aaa15b0544da7201a54011c257460 SHA-256: c0a370c7a7d89d79b0d8aa6ad61b1a4c7182b3eb8631d3f93382734dfda65014
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm and a callback phishing lure. The document contains numerous embedded URLs pointing to PDFs hosted on various domains, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and the nature of the URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://runwellconsulting.eu/file/file/34407832913.pdf In PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/rowuson.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/57068617423.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/xawasetexotudazejisolaso.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31026872547.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/juganamepiximusajub.pdfIn PDF document text
    • https://equalland.com/uploads/File/4909045657.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161361e97d5de4---fotozoviwekeb.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/36779791151.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/30431887214.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/48398258820.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/lafoboxomuxo.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/221746198822.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/zetejatukorefiguvugolina.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/mazoji.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/55784851043.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/41826611683.pdfIn PDF document text
    • https://bawauang.com/contents/files/34943198038.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/37653581374.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/fd5bed057d2f025c55b317091d13152f/24965047478.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/46169870901.pdfIn PDF document text
    • http://byecook.com/ckupload/files/xesewopafufuf.pdfIn PDF document text
    • http://getvisa.ru/images/File/saximimuperevofajak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=need+for+speed+payback+download+for+pc+windows+7PDF 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_off0000b8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E3 15360 bytes
SHA-256: 6f33d2604fe8da43c09634e7c5560aeda3b4cdf801a0dc2919045a44524a78b1
font_01_sfnt_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 10976 bytes
SHA-256: 9717b4164161ddf52195d3e029d667212d7a7fd2e995cfde4ef056bad435105a