Malicious PDF — malware analysis report

Static analysis result for SHA-256 720d2fdc61e75fd7…

MALICIOUS

PDF

107.3 KB Created: 2021-09-18 09:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b54c86b745dd9f7b731835cf11ecb87 SHA-1: d4e4b0d9b937036908776cc081cc2cc971c717bb SHA-256: 720d2fdc61e75fd79c39dc6cc3cbe5ea6353d1a58efdc93760b43b7f9b8609b7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm designed to host other PDFs. The presence of numerous external URIs, many pointing to disposable domains, strongly suggests a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and URL patterns are indicative of an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hublihorse.com/uploads/userfiles/files/20029219275.pdf In PDF document text
    • http://rentbucharest.net/images/userfiles/50755738964.pdfIn PDF document text
    • http://surestegc.org/documentos/file/41850445139.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e2a499d50---donotopadofinisufanexukov.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/48877749442.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/ruwoluwebokabe.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631217189.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/juvoforuwupatomabobi.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/92789252454.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/25206635586.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/zetexuvanazipumafuwuw.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/62496939284.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/21649579088.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/femanunapuvixejobi.pdfIn PDF document text
    • http://4darchitecture.org/img/all/lagutaxazov.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/gomodaza.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/21964868407.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/32921641108.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/70023039766.pdfIn PDF document text
    • https://lesura.net/userfiles/file/92566996738.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/22232488907.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/20255164704.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7550218c3---wuvalapelodijanilinenex.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/77162591687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fnaf+security+breach+free+downloadPDF 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_off00013a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 19712 bytes
SHA-256: 438be4cdd9f1a3c1f36af84edbd414caac82a5bcf7e83f3a2221a77ec526ac58
font_01_sfnt_off00016d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000185a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185A9 10992 bytes
SHA-256: 2a4054d0b20cc801d15e4f0b523f5366b5c907545e19bb06298451f65a80bda5