Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aafeb8eae93d2f4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 18:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 890684f0c89f3819c8324f50d3cfb6e9 SHA-1: 3cc997a78045f3c9e4e57d4f0c2c6bf2bcc47b9d SHA-256: 9aafeb8eae93d2f4cf32ba4f72e6838000b9bd38b7ae5ab7f649e4ddd9751829
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous disposable domains, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown URLs strongly suggest a malicious intent to redirect users to harmful content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tidymoney.com/ckfinder/userfiles/files/19649541790.pdf In PDF document text
    • http://ctm.it/userfiles/file/gituduboxorofuw.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/1985921544.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/rukesuladuwuturijodoge.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/lisamoxajufidebeliluba.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/mazutopiwodebabimo.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/fiwasupom.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/10956365686.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323695145d6---38463282032.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/80914309014.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/56542274206.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/3639139928.pdfIn PDF document text
    • http://esangsok.com/upfile/files/tiwimaruja.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zizibelo.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/59633756149.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/4655221621.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/54934042275.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/godilodogewiziziwovub.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/devazaxujesofuwixeje.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422e1c521ad---tosegevupufitegexota.pdfIn PDF document text
    • http://amdind.com/userfiles/file/jewovibofori.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/ribafufezasimosamito.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/43716590602.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/55790817478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=phone+ringtones+malayalamPDF 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://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_off0000d5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 17516 bytes
SHA-256: d5d0ae4f3f2e39c77789731c6df21fd584bb7b07eef8cbc9bf6c30276f8fa1cc
font_02_sfnt_off00011b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B00 10672 bytes
SHA-256: 7d424e995eb7f91f9b0605de2437486a5851720084ca30bad3a2a4efce0f1e5a