Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea1300aef9342ac…

MALICIOUS

PDF

93.0 KB Created: 2021-09-21 08:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d2914479a0c6619f0d1727d3b9f132e SHA-1: b8cb79b32402d5777ba988be95f9b6f43201490c SHA-256: 1ea1300aef9342acf3ac8fb759bd7f8337d7d439b1a336cb4c935230ae1b509b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which appear to be disposable or low-reputation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=list+of+idiomatic+expressions+pdf
    • http://arcstema.com/userfiles/files/70290954110.pdf
    • https://creteservices.com/FCKeditor/userimages/file/95232728451.pdf
    • http://www.puhito.hu/uploads/jumudazomoxeb.pdf
    • http://freewest.at/66466519277.pdf
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/puziwadulusesologiwusojes.pdf
    • http://insfilings.com/skyzone_classic/upload/files/zagivowu.pdf
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/3e248aa287fd4f74ca8e51b0accc7493/91992932042.pdf
    • http://marikitaberbagi.com/userfiles/file/bosasotogitawumemoxerepu.pdf
    • http://nbmounts.com/userfiles/file/1631846008.pdf
    • http://karpatskiles.ru/store/file/44170785865.pdf
    • http://nenorm.com/files/files/gekabop.pdf
    • http://euroambulans.pl/userfiles/file/begazavekimiwuxen.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16145289c0d12e---safaniwoso.pdf
    • http://rubensova16.cz/files/file/19968002129.pdf
    • http://veganogle.es/uploads/ckfinder/files/mavivewafufiweganeli.pdf
    • http://mtsp.by/userfiles/files/dofex.pdf
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/53833051967.pdf
    • http://top-caster.com/userfiles/file/putunalozagimatar.pdf
    • https://geya99.com/ckfinder/userfiles/files/rexijafegiliwogesevolaze.pdf
    • http://140.121.180.103/ckfinder/userfiles/files/bijufajug.pdf
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/57680922769.pdf
    • https://digireg.at/upload/xujegowuzilepo.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_off000104c3.bin
c929b69766ae64476a754178f8ce9825e7b1ebdad8c313aab21c401b82e0d053		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C3 10792 bytes
font_01_sfnt_off00011da4.bin
0b14f548aea6ada5359fb599a3bad07645da2589fab47612baabb34eacfb05c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 18868 bytes
font_02_sfnt_off00014e76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E76 16792 bytes

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