Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd26401a843184dc…

MALICIOUS

PDF

67.6 KB Created: 2021-10-01 22:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 01c4fccf954d32714dacc807f939c951 SHA-1: 0933fcfe41b6e9dd6771a6ae62c79eb4ec398f50 SHA-256: cd26401a843184dc0db566499fea83a9c58f4fe8ef4eae4eb30f7f70a7089766
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file 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, where the user is prompted to call a number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nezamirekhaseafoods.com/userfiles/file/80042168092.pdf In PDF document text
    • http://aaas.handyfriendship.com/upload/files/xexaxanixotiguxururula.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/80948337149.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/zusuporupekelo.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/fevaxutarezin.pdfIn PDF document text
    • https://totszerdahelyikultura.hu/images/file/bimuweradabanofefonesete.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/55202456898.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/mesedasoseweja.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/lenivetivulufoxanuz.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/jixitizetaxudusezulas.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/82181842458.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/75183971771.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/zotanusuv.pdfIn PDF document text
    • http://xycrusher.com/d/files/67971159572.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090117232270554.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/30520588887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=play+football+heads+2020PDF 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_off0000a6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6E7 16580 bytes
SHA-256: 56b52c0a4a478fb19a88a08293c294a0e7f520007883ca27dd94374b8d0ca9c0
font_01_sfnt_off0000d11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 10652 bytes
SHA-256: 5d9f324694c0570e0d0e0c0115d5974c491cba119414b64ef9660aac226ad882

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