Malicious PDF — malware analysis report

Static analysis result for SHA-256 499a395c5a2b11b1…

MALICIOUS

PDF

81.2 KB Created: 2021-10-15 16:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d401e99915ea3912a5215061d618531b SHA-1: efbcdad98fe2b557cf3e31848058a147e1662b44 SHA-256: 499a395c5a2b11b18dce19292b8b109e87ddb497d710efbc439ed1543c4a7f36
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. Although no document body text was extracted, the presence of numerous embedded URLs and the heuristic 'SE_CALLBACK_LURE' strongly suggest a social engineering attack. The file's structure and embedded links are consistent with a phishing document designed to trick the user into initiating contact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://floral-design-lindgens.de/userfiles/file/towesifapa.pdf In PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/80614724241.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/lumij.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20211014060808.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/tajurirubomubagapebiga.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/99691621152.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/36530643695.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/roxixik.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/17619905467.pdfIn PDF document text
    • http://petikdaun.com/contents/files/26841674222.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/64802411116.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/vewufufupixakegutupejinur.pdfIn PDF document text
    • http://champagne-ardenne.annuaire-regional.com/ckfinder/userfiles/files/21471780238.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613678de76627---66633844959.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/72531564420.pdfIn PDF document text
    • https://bloc-immo.com/images/walufesavewevegabefe.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/tadazisexuzofekex.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161559b234ed8f---lunedevamokejamafabogixa.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///20679206557.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/levemuwoze.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/pereziwejudabanuvovu.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/mapuweg.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/sizunefujoxiwikulatexuzok.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/balenedagafepomakafu.pdfIn PDF document text
    • https://basisangka.com/contents/files/vedevifobopifejositegago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/UsNeCLCzgYg/uplcv?utm_term=mob+of+the+dead+dlc+packPDF 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_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 19304 bytes
SHA-256: 8de9d7dac6c0c025a2c3295a515fb1bd69b2fdce2396c82cf5c3713060dfa06e
font_02_sfnt_off00011fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB1 10476 bytes
SHA-256: 2c0b98f00cc3c4c5cf4760fa31af8ed917803003577deb6954048f3e7d989c11