Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2fcd0e383429a6…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 20:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cfecb47f01ba67e74f97d82528aa03e0 SHA-1: 2f08c4730aad4d9d8680f6c199563a761c942ce0 SHA-256: 4b2fcd0e383429a62ef0487f3ab0f4bed5bafafd24bb92f44667f050be753209
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and contains a callback lure, suggesting it's designed to trick users into calling a fraudulent support number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://olivier-daulte.com/ckfinder/userfiles/files/36634497200.pdf In PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/65658200249.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/gididomegifetetusizat.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/kanolapozuxorok.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/82451323117.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/tebotakiwozuzukaw.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/jilejog.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161539f9644edb---zarobidota.pdfIn PDF document text
    • http://gensugroup.com/upload/files/vobifonadevunivomiji.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/xinuzase.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/wiwozag.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/30686537899.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/wodaledobolutidiga.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/81163279888.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/jerazi.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/xexutumupejotowerago.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/32951237674.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/19710580631.pdfIn PDF document text
    • http://grimastone.ru/files/60696375233.pdfIn PDF document text
    • http://maksimetall.ru/files/42625450243.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/dudovipedevepovobas.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/vosaxivixotipajivun.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/77082514677.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210926_B6F6C6AC2C43CCB7.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/tebipodun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=double+displacement+reaction+worksheetPDF 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_off0000b00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81E 15540 bytes
SHA-256: df9e0c26227ebb044e0a841dc0572f2549e3f0f21d0e1c7bdaeb6c3103f2f8fd
font_02_sfnt_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 11196 bytes
SHA-256: cb2969893039e57cdd79da7e04f4b54051843c7cb0deceaeefc146717b3369b1