Malicious PDF — malware analysis report

Static analysis result for SHA-256 828697fd2dc61780…

MALICIOUS

PDF

84.9 KB Created: 2021-09-10 02:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10ad71847415b8bf8c46a90a3a13e45e SHA-1: 0bcf776507ec2c81c5288a0b3d4f0a67fd5f59e2 SHA-256: 828697fd2dc6178013ab242badf07fedfcd4dc18649a1c0b515d9d7dc558a0f0
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of an advance-fee scam. The document's content, though heavily obfuscated, combined with numerous external URLs, suggests an attempt to trick the user into believing they are receiving a prize or parcel, which is a common lure for advance-fee fraud. No scripts were extracted, but the PDF structure itself likely facilitates the redirection to malicious URLs.

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://krisoc.ru/uplcv?utm_term=galaxy+wallpaper+for+android+phone
    • http://prestinoequitacion.com/imagenes/upload/files/fidisezilimozid.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/fijopofesogiwoganurili.pdf
    • http://sellmysayarah.com/userfiles/files/69964346668.pdf
    • http://ufnk.fr/app/webroot/files/file/61507326853.pdf
    • https://wtmasonry.com/ckfinder/userfiles/files/zonamos.pdf
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/fotozuvuparinorogikajan.pdf
    • http://thegoshow.net/userfiles/file/26671874956.pdf
    • https://gymlesgeants.com/upload/editor/file/71138495454.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/xozilagerubevezetivex.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/volekudasijakaxol.pdf
    • http://trips-in.com/ckupload/files/388929546.pdf
    • http://xedaptap.net/userfiles/file/zamodowi.pdf
    • http://studiorumeo.it/userfiles/files/lajoraken.pdf
    • https://observatoire-omic.org/documents/file/81148989225.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fd1f3194c1a205c6626ace651307ef3/vomadanifoxakowijol.pdf
    • http://tw-jia.com/uploads/files/202109060853174662.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/getodelosederirimuro.pdf
    • http://e-hematologica.pl/users/file/34810598086.pdf
    • http://alacarte-grafik.de/userfiles/file/milejurov.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a934be4053---73792958734.pdf
    • https://mihalex.by/files/files/18028935419.pdf
    • http://partnercable.com/files/julorotojugokofala.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_off0000e732.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 16792 bytes
font_01_sfnt_off0000ff49.bin
fcd8b228afa2487d90aef7db5b604241125346390fa805a94a3a62338f129b7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 10668 bytes
font_02_sfnt_off000117b4.bin
1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117B4 17620 bytes

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