Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb12d5a1c662436a…

MALICIOUS

PDF

69.0 KB Created: 2021-09-14 21:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 221d5cc9be1d293e3d71b18f2de09f18 SHA-1: 45e5022909f9a258ab0bb4617289f60821129466 SHA-256: bb12d5a1c662436a349036a591c27454d4f7a5b1e3f981dd3cba49400b61878a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous embedded URLs pointing to potentially malicious sites, and the heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to prompt a user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it may leverage JavaScript for malicious actions, such as redirecting to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://infrive.ru/uplcv?utm_term=gordon%27s+functional+health+patterns+example PDF link annotation
    • http://mansiya.com/uploadfile/files/14295005206.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/paposikelajoletev.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/jolutuwelokeze.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/82542860891.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/63636581297.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/40335321.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/gixagutigudikukipaxev.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/pifasapopevirolutepibapa.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/mebosukezobetexawebawem.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/zebafomavutojiranovevek.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/zepilokul.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/wogebokuruk.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/15204767977.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/pegakini.pdfIn PDF document text
    • http://blccy.com/userfiles/files/dudebelam.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/sukudanizifijova.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/69291774006.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/86187847772.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_off0000ad05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD05 15668 bytes
SHA-256: 2a0c4b94e3517776e1471b50aa84851fc70367b9c6f4acb567463ab565f9da47
font_01_sfnt_off0000d43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 11160 bytes
SHA-256: 9105883e9451f333497235f4ca8dabd968b0f96d7a137461de47c942c7fcb38d

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