Malicious PDF — malware analysis report

Static analysis result for SHA-256 185b80e252d606ea…

MALICIOUS

PDF

74.2 KB Created: 2021-09-11 21:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d793cfdf8d8e6d056c8139dadc1d6f25 SHA-1: 2521e91f054f45b0ebf2004b4d7892a2d8fa18b4 SHA-256: 185b80e252d606ea6a32b2f94170c01b0d4d982624dc64b847cf6f6085211a24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many pointing to suspicious domains, and exhibits characteristics of a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to evade detection by distributing links across multiple low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zmiz.hr/userfiles/file/77036743927.pdf In PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/jaresixido.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/55723321704.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/48282204346.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/nosomifirorene.pdfIn PDF document text
    • https://hirurgija.me/files/lexuxemivemew.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/13761627014.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/32037286337.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/14311822386.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/puzimugufirejivulevaje.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/90195284985.pdfIn PDF document text
    • https://tempegaring.com/contents/files/vavupomuvigejafogebumiz.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161345c20b45e6---60076671472.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/18121270872.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136a639c340d---44854834834.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/defoli.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/49757172123.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/laruxatowi.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/mologaz.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/46947283626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kruti+dev+011+font+download+for+android+mobilePDF 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_off0000b887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB887 18916 bytes
SHA-256: 28aad7832127f83978d415f9e978e4c01b88973610f5239ce9454bedb69d1c40
font_01_sfnt_off0000ea1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 10904 bytes
SHA-256: d430378146afc29c5b2298930e17345698ceeca16536c3fe90209d8251b933bd
font_02_sfnt_off00010367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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