Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa1995d2ef87c7d…

MALICIOUS

PDF

68.0 KB Created: 2021-09-18 09:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9451b83841222ba2e64096485936fe22 SHA-1: 523c8acd21d7f44ef4894a04964a8bd060f254d9 SHA-256: 3fa1995d2ef87c7db6c6046b521748e760a6085fd0453d1f0c00e64cda80a7a6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pattern, where the document likely contains instructions to call a fraudulent phone number. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or redirection attempt, possibly leveraging embedded JavaScript for obfuscation or further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=how+to+logout+of+gmail+on+android+phone PDF link annotation
    • http://manegedebuitenwijck.nl/uploads/file/53867189321.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/27402082487.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/38645389282.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/83075283267.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/17241470742.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/nizufepigeritisewufuz.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/suvixa.pdfIn PDF document text
    • https://aayams.com/userfiles/file/virutiginajeragigabaz.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210917155333.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/65217198503.pdfIn PDF document text
    • http://clickvay.com/upload/files/98832792688.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/65880329624.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/julezobela.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/74689989815.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/41773463333.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/powisasixad.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/46377834601.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_off0000ab95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB95 15116 bytes
SHA-256: e2d42f2ae06e0cd93da0a68c0f2775d6af0368477dea9a0565f3adb731084527
font_01_sfnt_off0000d1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 10952 bytes
SHA-256: 91f87f6348709845f477fea0b8e21ad2887637bb5287a874516d969e2bc9a162

Open this report in the interactive analyzer, or submit your own file for analysis.