Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd972af17eaccb63…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 15:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3d4de5f4707a655f7702d930f76718c SHA-1: 8e44a4cfa82ea31aba8932bca63292e8600c25a7 SHA-256: bd972af17eaccb6399fd837e9ff89dd97f7ff92c70bdfab7fc35868235898851
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of external URIs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a social engineering attack aimed at tricking the user into initiating a phone call. The file's structure and the nature of the detected heuristics point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://archism.ru/uplcv?utm_term=mod+apk+of+free+fire+diamond PDF link annotation
    • http://philipp-haberland.de/images/upload/file/tekojunuwefagejodopor.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/zukarekosibelaserorupipi.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/tokaxunafusep.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/zevekogot.pdfIn PDF document text
    • http://benly-carson.com/product/files/35725512499.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/tegumeworudipib.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/26774415.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/93002578138.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zimigugetobolor.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/zaxakagu.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/98609759270.pdfIn PDF document text
    • http://12shio5.com/contents/files/26763497675.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/jukapefenafozojafugaw.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/34099651275.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/6padqp8essbiqu4c3p0o4pkl3h/vokijuvepedokowu.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/zuwowejodedajas.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/pupezosozogutuwu.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/mujisolakitejefolopore.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///fubiwazesegisil.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/zisix.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/zarogolekaxiribakabiteje.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ad7bc3467ac8495a8b8351965f7d8200/53544214149.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/18345465151.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/ninevivoneramoxota.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50172992969.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/faboz.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_off0000bae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE2 10432 bytes
SHA-256: cf023e461df072030396e3ab24150d5b2d8f941441e3d5c202ae2237046912be
font_01_sfnt_off0000d274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 16240 bytes
SHA-256: 2db4ebafd787c8028992ecc9362ec518802212619422c7173d140e0e2a6815b6

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