Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf7f8048b802bad…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 17:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d93bf86baad345561976191af7d380bb SHA-1: 2eaf13970897628e5dad47e44c44a1b063db8654 SHA-256: caf7f8048b802bad70a5f6e6d6e44bfb1193bd3150c067e46b407d1c615f6c6e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and multiple external URIs, flagged by ML classifiers and ClamAV as malicious. The heuristics indicate a link farm on disposable hosting and a callback phishing lure, suggesting a scam or phishing attempt. The embedded JavaScript likely facilitates the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pospatrans.cz/UserFiles/File/radivokelowor.pdf In PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/24580953689.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/38036233860.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/34646805418.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/33796468916.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/59376867320.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/10016955271.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/ruloluzulow.pdfIn PDF document text
    • http://canadianrockies.info/files/file/kikomamiwoligolojin.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/70417646739.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/13767684390.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/mabumufotupubemewovoj.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/totaje.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/76120610583.pdfIn PDF document text
    • http://le383.com/uploads/files/93538624038.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/43193618597.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/41120458945.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/mixezisixuziledewasumir.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/94521302716.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1f3784010---78857758849.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/tivedupefu.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/28446272458.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/luledamudizedivunapawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=apps+are+not+installing+from+play+storePDF 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_off0000d6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EF 17468 bytes
SHA-256: 1296f46a65e5f6751cf95eee3762d651c3609b077e311de6aa269d1b90950cce
font_01_sfnt_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 10796 bytes
SHA-256: 16dabb601e7f4476681a1567586a9dd8275526f89c4655566ac754a4d8865695
font_02_sfnt_off00011cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1