Malicious PDF — malware analysis report

Static analysis result for SHA-256 381e632f92155f18…

MALICIOUS

PDF

68.5 KB Created: 2021-09-30 13:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 015ddec2a0d291b7b7491da2aeaf7d6c SHA-1: 000d752e6a7a6732d3afd56f5e28a4cb262ef92e SHA-256: 381e632f92155f18c732cf5a4fb75eb663ee5e10473921d83fb20c59b9f0e32e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is 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 phishing attempt. No scripts were extracted, but the PDF structure itself likely contains the malicious elements.

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 http://volkshilfe-ktn.at/images/content/files/xazeloboweve.pdf In PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/wasadiwav.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3966182fa---jigojizovivumanasuxule.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/rujesowasolukex.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/zezefadegaseduwaf.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210927155223961.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/53389358171.pdfIn PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/laralifatigurusew.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/28009668278.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/81796092362.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/pafugofipafasar.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109251803368517.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/63634314683.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/21550720880.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/wixigazafu.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/93647469449.pdfIn PDF document text
    • http://nemochem.cn/upload/files/55729152083.pdfIn PDF document text
    • http://word.mn/uploads/assets/widawed.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/21839647262.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/sowesadaral.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/49233495379.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/zonikujodijolugawebivobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+best+pc+emulator+for+androidPDF 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_off0000acec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACEC 11088 bytes
SHA-256: ac72464ce11b0477c9c2799ed9f6d740519aca23112c17e1eee7d9bee26b4d58
font_01_sfnt_off0000c659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6B 15148 bytes
SHA-256: de4429a0f48cdd450cf85d30527786b178989f0e88d15256ccd551317a6a3b8d

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