Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e5628f964386a8…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 02:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d27a3dd3ac1c40d37fc41fe0a21896c SHA-1: b3aeb638ef5c864aa65fb43b938d32b4c8c38e3c SHA-256: a7e5628f964386a83ba0587531c25f348d5740d1878f68bcf354e53e81f2c0f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, some of which are associated with link farms and disposable hosting, suggesting a phishing or credential harvesting campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://pacantioquia.org/aym_image/files/59224635823.pdf
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/moxab.pdf
    • http://mediaworld.pro/ckfinder/userfiles/files/zufodamelilonene.pdf
    • https://membermimpi.com/contents/files/90159142592.pdf
    • http://tienphat.vn/imagesflashupload/file/vatiwanizesikekinade.pdf
    • http://gillsandgeckos.com/userfiles/file/32253342414.pdf
    • http://dgkno.cn/upload/73725178821.pdf
    • https://gilbertems.com/videos/file/wowepepogakegivudaje.pdf
    • http://dom-2000.ru/ckfinder/userfiles/files/xadevokubusire.pdf
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/femuriwimuwafojibelem.pdf
    • http://montagnobozzone.it/userfiles/files/xifakulubev.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/tuluwomivas.pdf
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/27977703281.pdf
    • http://purofirstli.net/userfiles/file/sagubovokotezemexorofune.pdf
    • http://mtcnx.com/upload/fckimagesfile/48368539660.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/522521f4bd0eaffaaa91d2e33d34be4f/31293908991.pdf
    • http://righetti-ticozzi.it/userfiles/files/42537711298.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613542516a66c---44990306981.pdf
    • http://www.gabrielamaciel.net/images/content/file/1420954663.pdf
    • https://habibitours.org/ckfinder/userfiles/files/lenof.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+music+player+android+phone
    • 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_off0000d8ab.bin
58f8009fd760bcce45c7e59355ab5a23a378b89275596b1594aac2021fcf2654		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 11044 bytes
font_01_sfnt_off0000f236.bin
d57c6cb64de939a650da629ece753ad59fa7e6d17027a2336c165536f3dcb497		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 16888 bytes
font_02_sfnt_off00011dc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 16792 bytes

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