Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac7442a6f3358a7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 19:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce1dc00081d06a262db9479137b76878 SHA-1: 971d5114d8ea58318a73afcbfd7b4175e148bbda SHA-256: bac7442a6f3358a7f733c5408394ddc1c4fb220a88c40e1730ad20261c1df0d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=coin+master+free+spins+hack+2021
    • http://designbeginnings.com/upload/file/miwejavufom.pdf
    • https://edgecs.com/documents/tevujub.pdf
    • https://principesgs.com/userfiles/file/pawufajawu.pdf
    • http://eperon-kochersberg.com/img_db/kozobejak.pdf
    • http://stlukesfp.org/ckfinder/userfiles/files/38844356887.pdf
    • http://mrybalko.ru/files/rifizigibigavijoge.pdf
    • http://posicert.com/upload_fck/file/2021-9-3/20210903064742355329.pdf
    • http://we2meeting.com/ckfinder/userfiles/publics/files/sedalitagimenofidopujogi.pdf
    • https://qnzar.com/files/webofanosutaf.pdf
    • https://magyar-logyogyasz.hu/fileok/file/70744819492.pdf
    • http://timocomputer.cz/files/file/komuka.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318397072d8---8055406980.pdf
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/33889417340.pdf
    • http://kxnjl.com/userfiles/files/xoluruniwuvezaribib.pdf
    • http://ct-tci.com/cttax/userfiles/files/kojefalivefeb.pdf
    • https://rosanaalvarracin.com/userfiles/file/tabefunalunadaxewox.pdf
    • https://9ja-bet.com/userfiles/file/56831799411.pdf
    • https://abctranslink.com/ckfinder/userfiles/files/lonowovuwumiraxutusu.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/31903282812.pdf
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/53961433419.pdf
    • http://cjmfgx.morefriendship.com/upload/files/9404480158.pdf
    • https://nieruchomoscikomercyjne.co/files/file/5563160196.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_off0000dc07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 16792 bytes
font_01_sfnt_off0000f419.bin
fabd3d128a5bc1fc453c8cae022208b88085c22f1cebab8b9055011e9365c216		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 18580 bytes
font_02_sfnt_off0001251d.bin
2b1783372512ea98f84168e1bad11b4f868decb2eca52df488ad81ba38dd0f41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1251D 11116 bytes

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