Malicious PDF — malware analysis report

Static analysis result for SHA-256 d165d8bacc2eec7a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-21 17:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a78137354e812b965bf754f9c8413c83 SHA-1: b4ab4af991c22b3cb44ba7f2edfb2668c41505e2 SHA-256: d165d8bacc2eec7ab625df98ab72f3151f09a6fb5bbc74e673e7e2c1827c3bb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. ClamAV detection and ML classification further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://infrive.ru/uplcv?utm_term=someone+you+loved+partitura+piano+pdf+gratis PDF link annotation
    • http://flamefitnessstudio.com/cewit/images/file/12848945568.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/mudanewewapik.pdfIn PDF document text
    • https://motecx.com/images/file/jumibanesevekib.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/26450153204.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/76817088349.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/luzozeso.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/vixavawata.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/50600545721.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/bulevubajafojo.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/55385059991.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/14421431109.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/popojufivevum.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/gisepevunoxe.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146936139274---73631176868.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/raraxefulovawufi.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/debosujogabogokokepovo.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/japijesepodunetuxag.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/fumodasad.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/nogutexetuzevogikex.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/i96pfsr6djt4ldhch9a9fpqf9o/89403238174.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/35065374300.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 11196 bytes
SHA-256: 093910f9923276d794a3e320cedbb252755c7380d9bb2b536f1614e3b543ec68
font_02_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 17696 bytes
SHA-256: 2f1aeeae1da572875bda37d1d39d7a4af1bfd3fc3b5875f3b5a3ab43855934ed

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