Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c521f4e9ff4ac05…

MALICIOUS

PDF

85.0 KB Created: 2021-09-21 10:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 59ed08d31e99ce4be4a2ce9d550d6839 SHA-1: 5b5c41b1258b922fb21bd1d25e0bbb1c41515486 SHA-256: 9c521f4e9ff4ac051c76582bc8912e67ef47827132dd35f9635aeae7b46f4954
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a callback phishing lure. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to direct users to potentially malicious sites or initiate contact for fraudulent purposes. The presence of numerous embedded URLs, many pointing to disposable domains, further supports a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://feldmann-spedition.de/pics/userfiles/file/30179213611.pdf In PDF document text
    • http://feach.ie/images/uploads/file/zofalewikerutugojox.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/xejimofananakaxajef.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/supunobajalaxuxabusuvituz.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/mifulejurukopiz.pdfIn PDF document text
    • https://laser123.com/geektic/files/2413107677.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/88197808768.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090518103467.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440ab07d173---46553765678.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/gisarej.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/73053821433.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/fopemufu.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/kegujitimuzupufexebemub.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/20570673576.pdfIn PDF document text
    • https://masukpt1.com/contents/files/2463174280.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/46192053997.pdfIn PDF document text
    • http://destock-groupe.com/userfiles/file/35909943672.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/40860186822.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/29555760758.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/37133812576.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/xitavebufup.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/depofexugujobos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=3d+among+us+game+onlinePDF 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_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 17944 bytes
SHA-256: 13686ad37afc076feab2cd36b886aed0a89b311206c7551241d51f443c498a18
font_01_sfnt_off000116aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 10568 bytes
SHA-256: 22221723b7e17187494e24ca0d8f560b2f2452c6e291d5040c2422dc94cc2099
font_02_sfnt_off00012e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1