Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b46814ec9d30c2f…

MALICIOUS

PDF

85.5 KB Created: 2021-09-11 10:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df6100861851d034f0b287672a05ec79 SHA-1: 4a3a18cf9ab85bb8258c74b877a9003ea4cd536e SHA-256: 9b46814ec9d30c2f970ecd9ecffc4d55d2ef8682d1b155ea46d23f86ba6560c3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pixomot.ru/uplcv?utm_term=top+100+phrasal+verbs
    • https://aradmissions.com/ci/userfiles/files/32965383994.pdf
    • https://ever-progress.dacola.com/upload/files/worisalaguxeper.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329e93357e4---lumabi.pdf
    • https://cochleartudaskozpont.hu/files/31555917551.pdf
    • http://www.uc-kushiro.net/images/library/File/29495509953.pdf
    • https://tecnibat.net/uploads/archivos/82077292088.pdf
    • http://imhome-listings.com/userfiles/files/gorasibu.pdf
    • http://akcjonariusz.com/UserFiles/file/62395029553.pdf
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/6768926624.pdf
    • https://tskrea.com/userfiles/file/gemosovifasu.pdf
    • https://ww150005.linebot.net/upfile/files/20210911112225.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/kopobukekepijikixonuxex.pdf
    • http://celcg.pl/uploaded/file/nifiwemobule.pdf
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/15467054729.pdf
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/51434623373.pdf
    • http://kapsalonvogue.nl/files/file/jetamujevekimunifog.pdf
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/lamedilenokovibag.pdf
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/galofakenomuxos.pdf
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/rexenigugipilijito.pdf
    • http://gavionescodeinsa.com/userfiles/zewufinibudamorosabu.pdf
    • http://crosswaysrecruitment.com/userfiles/file/fipotorufadulu.pdf
    • https://lapdonline.org/file/bofozopatanoni.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_off0000e5b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 16792 bytes
font_01_sfnt_off0000fdcd.bin
d1e4c319306fd8ee351c20dbd8498b370d1a5ff14e7f1f21123d6af7b1f2543a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 10396 bytes
font_02_sfnt_off0001154d.bin
fbd1a7ef8495a852749f2db93ec4065eefa382aa5a46932e0897ed0956a2c89c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1154D 19616 bytes

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