Malicious PDF — malware analysis report

Static analysis result for SHA-256 714fdafb93668a79…

MALICIOUS

PDF

70.8 KB Created: 2021-10-02 13:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0c1b1501e2ef3330dad712533d504039 SHA-1: abbcfe768b18d53d375d7ac7ed46e49d6962f864 SHA-256: 714fdafb93668a79f394cb5b63fdab44e8878fa629c4a48eb5fc27378fcd0374
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a phishing attempt. No scripts were extracted, but the PDF structure itself likely facilitates the phishing lure by presenting links or content that prompts the user to call a number.

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391e5857250---54086733732.pdf In PDF document text
    • https://nawaasha.org/userfiles/file/pugob.pdfIn PDF document text
    • https://produse-zilan.ro/files/rugumirirevut.pdfIn PDF document text
    • https://people11people.gr/uploads/File/lonebetoximidexokuzan.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/15594951653.pdfIn PDF document text
    • https://healthresearchinstitute.net/userfiles/file/salopibozuvomikaso.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/51424363733.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/39502152798.pdfIn PDF document text
    • https://proxus.nl/file/loluzesuvi.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/salugibotejukeretumot.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/pedixabegananuzawuwuz.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/soran.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/pawirisul.pdfIn PDF document text
    • https://cncunse.com/d/files/51867741259.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/wunojekativamo.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/zijamegatomatixomido.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/xegubaxi.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/81662595978.pdfIn PDF document text
    • https://tierlistei.ch/downloads/97758072731.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/677937835.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144dfe59619f---dojewoviluduguxipozi.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/regujiwiv.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210919230736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=48+acres+to+square+feetPDF 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_off0000b281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA93 16752 bytes
SHA-256: 7a002b120a58a6ab4def4db60e64ba094a93ebe03c48ec0acb1184fe1c264f31
font_02_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 10524 bytes
SHA-256: 0d1ecf3ce834309ed83b737b6d7cc60a08f77b26d8a9df756840af0dfc020f3a