Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17adce7fd8724df…

MALICIOUS

PDF

73.7 KB Created: 2021-03-25 11:04:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96dfdab61f06b0365e5aec4767e71f08 SHA-1: 93d2c490ee78cc65147da0e738d91e635afcdd31 SHA-256: d17adce7fd8724df7e5e96f79449e2d74e0b63deddb61aead8797b49f2684603
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to PDF files with numeric slugs, indicative of a link farm or SEO spamming technique. The primary URL, https://xezojetit.ru/wix?keyword=nintendont+wii+u+gamecube+controller, suggests a lure to a potentially malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/wix?keyword=nintendont+wii+u+gamecube+controller
    • https://cdn.sqhk.co/movozuba/hfjfBdf/98889596857.pdf
    • https://cdn-cms.f-static.net/uploads/4453329/normal_602096ba3224e.pdf
    • https://voxukosobezut.weebly.com/uploads/1/3/4/8/134846839/176999.pdf
    • https://bajorenurelop.weebly.com/uploads/1/3/0/7/130739037/2671595.pdf
    • https://cdn-cms.f-static.net/uploads/4459916/normal_60258e3c56b17.pdf
    • https://lomapasaxanigef.weebly.com/uploads/1/3/1/1/131164081/9664214.pdf
    • https://cdn.sqhk.co/tajugajobib/gdidXJc/world_winners_cup_beach_soccer_2020.pdf
    • https://cdn.sqhk.co/guposidum/iW8hjKp/biwifi.pdf
    • http://fakurivevid.scienceontheweb.net/pekufugaz.pdf
    • https://cdn.sqhk.co/busoleva/0aib7ii/planet_der_affen_survival_besetzung.pdf
    • https://cdn.sqhk.co/rifojimuna/giibhf6/96145798920.pdf
    • https://static.s123-cdn-static.com/uploads/4379369/normal_600030af04410.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xotopusedewix.myartsonline.com/77558525830.pdf
    • https://uploads.strikinglycdn.com/files/b85264f1-c359-41d3-a8e1-ce54e281a70c/sekifosibusideme.pdf
    • https://uploads.strikinglycdn.com/files/da74baa1-f58f-4eb5-b0e9-dcfdabf48ab8/how_to_connect_canon_sx710_hs_to_phone.pdf
    • http://likutolejit.onlinewebshop.net/45885163758.pdf
    • https://uploads.strikinglycdn.com/files/85c2a6ef-2b79-4112-b3d3-70bcac046f07/zojirushi_water_boiler_and_warmer_made_in_japan.pdf
    • https://uploads.strikinglycdn.com/files/fc98a98c-a397-4f23-bf9a-471e2829c471/que_es_secuencia_lineal_en_literatura.pdf
    • https://uploads.strikinglycdn.com/files/d7dc6708-c24a-4222-9ae0-4e7e70449a12/11498849732.pdf
    • https://uploads.strikinglycdn.com/files/b287a62c-3bcc-4d8f-abf5-7ff077b75084/dadejemowewukorividuz.pdf
    • https://uploads.strikinglycdn.com/files/cd6c9ec8-3951-45a3-9e57-114d48793d00/52251425027.pdf
    • https://uploads.strikinglycdn.com/files/7954dbf6-9b0a-43fc-baaa-570a4657701d/86532401758.pdf
    • https://uploads.strikinglycdn.com/files/9ec0bded-b8a3-4384-847f-9cc5b269dd3b/kuzafebuzowukebal.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e393.bin
80d1cd65168897528e045946026f40c485cea0d6ec38b1c13cb9a5e379dfb640		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 5280 bytes
font_01_sfnt_off0000f589.bin
25a32d459f13f39652e01a43ed36956ab0b1f5c4d42ed9bfa269a2de94f313d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 10528 bytes

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