Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c41982eaa7497c2…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 05:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 482c5e688866314d5241d898901f3e3e SHA-1: 7f7b69e439a52e19cfee320c8ee19892d5cc162b SHA-256: 9c41982eaa7497c274c5b2af671ba819e2f7bf384849e0d65976da6fc5d27c6f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of embedded JS and the link farm heuristic suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://wecareu.net/ckfinder/userfiles/files/xudugumelitamafixonap.pdf In PDF document text
    • http://abc-tel.ru/data/File/73750459386.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/lugezexoriwukuxulotopolum.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/78610092069.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/fiwined.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/95ef99518fb4a501f73ed2d64dfa62e4/80614215905.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210913043609.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/tejisu.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/ziwafosi.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/12486415192.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/tajowowovemabutixiru.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/38320903512.pdfIn PDF document text
    • http://word.mn/uploads/assets/tumemezipobab.pdfIn PDF document text
    • http://chemicalengineers.ie/images/pugimemanilusibetabop.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/26575388581.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/fisob.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8f711ff4---93279467596.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210919231603.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/9596357889.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/69402610776.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/fovosokizoruvodakobobogot.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/buragetelax.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/fagune.pdfIn PDF document text
    • https://telorgabus.com/contents/files/16390536906.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/razabitajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=watch+rogue+one+putlockerPDF link annotation
    • 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_off0000b072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC889 10580 bytes
SHA-256: 3f48f74a967a0057b9beaecd8c900d0be71af2439d0f982d517f9f62ab34831a
font_02_sfnt_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 16124 bytes
SHA-256: ec6f936bdbc90b1ab426e0f8fad41bf45a7217e028e99475438c87432a3a81da