Malicious PDF — malware analysis report

Static analysis result for SHA-256 3adfdf786d58e90f…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 17:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8180b57be553082445dda286e0d6973f SHA-1: baba5429d0f5e5e4e1fb4daea263ad564696be79 SHA-256: 3adfdf786d58e90f12f3c9eb94c253c39124f53116ad788a59bd8a8ec57fc810
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a clickable action, designed to resemble a full-page screenshot. The embedded URLs, such as https://nomylo.ru/uplcv?utm_term=free+instagram+accounts+with+1000+followers, suggest a redirection to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nomylo.ru/uplcv?utm_term=free+instagram+accounts+with+1000+followers
    • http://apcmagon.com/userfiles/ripukoxetuwogufus.pdf
    • http://dienvietbac.com/uploads/files/nopexe.pdf
    • http://artikos.pl/userfiles/file/97521266140.pdf
    • https://mclandpin.com/calisma2/files/uploads/732253986.pdf
    • https://diphong.com/uploads/rakavovoku.pdf
    • http://lafiestadelmoto.cz/files/file/gisesidadowivoniniwuwowak.pdf
    • http://www.dean-cpa.com/files/adminpic/file/demagefomowudarogigukena.pdf
    • https://tgvl.in/uploads/fck/files/81456700953.pdf
    • http://worldcastlive.com/userfiles/file/nenuregisigim.pdf
    • http://derkwoo.com/upload/editor/files/95016055259.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/remus.pdf
    • https://ce-mi.pl/uploads/userfiles/files/kizunox.pdf
    • https://shivajigrihnirman.com/singhania/downloads/file/66088215183.pdf
    • http://dailythang.com/userfiles/files/27974070569.pdf
    • http://cnwt.mgo.cool/upfile/files/2021/09/01/daguxef.pdf
    • http://dungcucaytrong.com/images/files/fufoli.pdf
    • http://bonezi.morefriendship.com/upload/files/16691163716.pdf
    • http://www.mousumibanerjee.com/fckimages/file/29453415039.pdf
    • http://brmxn.com/userfiles/file/20210910045645_udgo8z.pdf
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/89570758089.pdf
    • http://spharma.ua/files/file/87330187658.pdf
    • http://csc028.com/userfiles/file/20210925194951_zs4aso.pdf
    • http://forspeed.cz/ckfinder/userfiles/files/94345536757.pdf
    • https://xn--z4qq44i.tw/upload/actfiles/41705424610.pdf
    • http://sake2metustin.com/uploads/files/83973191083.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_off0000ae60.bin
98fe2fabc037549cb2da57c45f3823c1f2599d94839a2cecee2a3a3d6e5e8653		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE60 11120 bytes
font_01_sfnt_off0000c841.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC841 16792 bytes
font_02_sfnt_off0000e053.bin
99207a75811a984ee20d38aa367db3379d43a9d821e62f1cfbe5f7a396cb6e56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE053 14200 bytes

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