Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76f3347d842972f…

MALICIOUS

PDF

94.5 KB Created: 2021-09-22 18:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d6495953ccfa17f5b19b3bc8691c2b8 SHA-1: 22342327a43281da512cb6acd2129db43dffd825 SHA-256: b76f3347d842972f2c5af0d3a471a62ece8d7da791f1adbe9d1539cf305473b1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. 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 URIs point towards a malicious document designed to deceive users into initiating contact with the attacker. The presence of numerous unknown URLs suggests a link farm or redirection infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://bodegaadrover.com/userfiles/imagenes/nafelabaredotebad.pdf In PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/mowitebijureduwokutinibe.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/25022345380.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090612314570554.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/31617380174.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/83945825669.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613264fb71247---42279604679.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/42326894937.pdfIn PDF document text
    • http://kaies.net/upfiles/file/mebasudubibufofinoro.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/29816353979.pdfIn PDF document text
    • http://gro-felix.si/uploads/21313891053.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/kodojivuna.pdfIn PDF document text
    • https://poker-fire.de/file/zovunitibisodimup.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/xepoj.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/93029137418.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/15774773535.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210907_0BF997514323E8A5.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/95236350910.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/potapexamawe.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614adc33a677d---bapatov.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69921181918.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/20539953189.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/tawod.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/zidufewemu.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/lijovuwugefobikejetixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=format+fichier+contact+androidPDF 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_off00010d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0D 10504 bytes
SHA-256: e4d6231a55d8974573b6acac0cd8f4403aaa52dedec27d36e9ee674c9d4d6945
font_01_sfnt_off000124b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B3 18420 bytes
SHA-256: 5fe038d8148b467f3202eee98078f6092da183bce953bf00f5746de9a16ec7c7
font_02_sfnt_off000154cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1