Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bf01d4f64201cb…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 09:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9da17f7b49fda7f772c5f25bd87a40d SHA-1: 210e2352948d7f6db9c6d99949c1703c52d82306 SHA-256: 16bf01d4f64201cb2757f71df08234b484afa2d868db744fca89249efda97ceb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://huyminhplastic.com/upload/files/duvijupegoxisenatawefep.pdf
    • https://liho.cz/UserFiles/File/52591516732.pdf
    • http://jullien38.com/ressource/site-image/files/74568859908.pdf
    • https://faresaldabbous.com/uploads/files/vonogapev.pdf
    • https://aawyx.com/sites/default/imageuser/file/parojunesane.pdf
    • http://touristclub.in/userfiles/file/sinobosidovu.pdf
    • https://ventsistem-bg.com/userfiles/file/zuxenofox.pdf
    • https://biholka.cz/uploades/userfiles/file/88503927661.pdf
    • https://philly.drinkpoint.com/uploads/files/fovigituxoduvumul.pdf
    • https://bonvoyageindia.in/ckfinder/userfiles/files/xaretuvukilazud.pdf
    • http://garantc.ru/userfiles/file/xidusiworedubozoniga.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/69972813879.pdf
    • https://paklya.su/design/img/upload/file/59221387802.pdf
    • https://inunekocp.jp/mailmagazine/upload/files/70975265617.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ab1fd6312aafd4124426ca1494d495ed/naxasep.pdf
    • http://wuxihemei.com/ckfinder/userfiles/files/20210907_060512.pdf
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/69740982605.pdf
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/zijukudumir.pdf
    • http://thietbiantoanttk.com/uploads/files/wixewuwomotu.pdf
    • http://madurastones.com/userfiles/file/setigabu.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305852e6d61---petel.pdf
    • http://3q1p.com/upload/file/210905112517259501ou2uv2z9ty60.pdf
    • http://studiosiriosrl.it/userfiles/files/254582592.pdf
    • http://sabaispa.net/userfiles/file/xodumef.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/78571741413.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=designing+and+conducting+mixed+methods+research+creswell+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_off0000db68.bin
6b0376933699d2ad1e360f1d9d39e14ded2fdeac17f35af5f9b50839a35bed44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 16528 bytes
font_01_sfnt_off000105a2.bin
96ea974fb339b91a61719e8abcc737c8b46f622ba69512075a1269c1fc87a4ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 11356 bytes
font_02_sfnt_off0001200d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1200D 16792 bytes

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