Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb8177ad4e1aeff…

MALICIOUS

PDF

74.9 KB Created: 2021-09-27 16:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87cf14c2ef2a3b904f99ee7952dd7471 SHA-1: d487c654ce78524fe9d879bfa5700c6fae60c5c2 SHA-256: fbb8177ad4e1aeff9ef2b26734d142a6be13a6c360e9426ac7a82cf613f05308
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm, directing users to potentially malicious sites. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=utorrent+slow+download+android
    • http://panda-es.tokyo/yamituki-n/uploads/files/nagesafuvakinunegunit.pdf
    • https://niboparis.com/upload/fckeditor/file/1630787323_1.pdf
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/96243371413.pdf
    • https://asiquim.com/ckfinder/userfiles/files/tunasaridejivodoxoxujavi.pdf
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/rexulefenasebomekivami.pdf
    • http://olgapolyakova.de/files/files/zesafisipevoveziwaxerijip.pdf
    • http://recuva.kr/upload/fck_img/1632626294/file/toxafuxeliru.pdf
    • https://crownprolaw.com/userfiles/Proj_Name/files/lufolojefojixidifoxenog.pdf
    • http://aa-nusd.jp/20240713869.pdf
    • https://rosettes.it/userfiles/file/18822460418.pdf
    • http://konferencii.org/js/ckfinder/userfiles/files/21605265275.pdf
    • https://cottonweb.net/userfiles/file/varaxopajiwonijevore.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613757335ad66---46088355632.pdf
    • http://es-manzokudou.com/yamituki-n/uploads/files/zanelegofusixebu.pdf
    • http://familie-schiecke.de/images/file/23844203192.pdf
    • http://yuli-china.ru/d/files/ginosakotedofopene.pdf
    • http://www.themixchange.com/userfiles/files/87738829848.pdf
    • http://canadapremiumlubes.com/survey/userfiles/files/dajekasiwubo.pdf
    • http://dmhu.eu/uploads/uplib/file/88184880739.pdf
    • http://studiotecnicopetrillo.eu/userfiles/files/99848043109.pdf
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/56211923169.pdf
    • http://vatlieulamnha.com/media/ftp/file/12411340297.pdf
    • http://siddharpeedam.org/userfiles/file/
    • 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_off0000b78d.bin
efe52fe25d3f9bf715fdd9698b0c0644ce3e47ae48c42156620d6cc742bfd7b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB78D 10336 bytes
font_01_sfnt_off0000cf08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF08 16792 bytes
font_02_sfnt_off0000e71a.bin
abbfe03b4b1c4a6bfdb40e6be1faef4bca886347d798f14f310fcdfa8facddc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 21412 bytes

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