Malicious PDF — malware analysis report

Static analysis result for SHA-256 334146514f8caf04…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 01:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cbb6cde18ad1ce5d9c4242115a6e9f2 SHA-1: 3ce8011e33ec81040d643092291c345abaff68b7 SHA-256: 334146514f8caf04458d69722df654f3068b3f36f4881bf1147ddff5c35427f9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, suggesting it functions as a link farm or phishing lure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of hosting many links on disposable domains, often used to redirect users to malicious sites or download further malware. The 'SE_CALLBACK_LURE' heuristic suggests the document may present a pretext for users to call a number, typical of tech-support scams or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=gta+vice+city+emulator+android
    • http://nandishoverseas.com/UserFiles/File/15721042266.pdf
    • https://kalitelivideoizle.com/resimler/files/vugukuju.pdf
    • http://cesarrodarte.com/userfiles/file/jebududidowebimure.pdf
    • https://4u70t3k0-4tl.com/contents/files/juvopora.pdf
    • http://ciccioinpentola.com/userfiles/files/xizoziges.pdf
    • http://bainihu.com/upfiles/editor/files/16132391948.pdf
    • https://pensiuneaselina.ro/userfiles/file/pubajivapevezut.pdf
    • http://autoscuolapezzano.it/userfiles/files/xiwetidiwasodagagixobe.pdf
    • https://alteanetworks.fr/img/file/jivamozas.pdf
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/29246330970.pdf
    • http://caythuocdangian.net/images/files/9052612500.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/dofuzewu.pdf
    • https://doina.md/fckeditorfiles/file/vozefilab.pdf
    • http://cn-biyoute.com/d/files/45009136190.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/xuxetoxotudiza.pdf
    • http://naturalfurnish.com/userfiles/file/71324406220.pdf
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/32732078267.pdf
    • https://thediamangroup.com/_images/files/xumogonabigiwojuf.pdf
    • https://wisestudentz.com/userfiles/file/34123290198.pdf
    • http://imosa.asia/uploads/files/202109091803084285.pdf
    • https://albizy.com/ckfinder/userfiles/files/52097561301.pdf
    • http://vswet.ru/f/96611432472.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad63.bin
c05086f0a5863a08547e9934ca789dea23fed0e27ab24422fe9f04e4dea4e642		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD63 17340 bytes
font_01_sfnt_off0000d98c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 16792 bytes
font_02_sfnt_off0000f1a3.bin
6fe184281c3b0db1f96146d4239c55df831926478c9a6f8c0a0c2aee1e2099fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 10680 bytes

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