Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e278b393759517c…

MALICIOUS

PDF

76.7 KB Created: 2021-03-23 08:19:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d73503295092de184b9ea0614e15eb87 SHA-1: b38ecb8869e8bfcccbe4b3216f779db7ebf30d00 SHA-256: 8e278b393759517cb4ae657e9d014b60e750259916608c5961da37a4e654c5d4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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.
  • 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://dugedepap.ru/award?keyword=makerere+university+courses+pdf PDF link annotation
    • https://cdn.sqhk.co/xawuboma/djejbjw/darkness_and_flame_walkthrough_part_7.pdfIn PDF document text
    • https://cdn.sqhk.co/mezewimaxus/ibhi1f4/kalomozuvenojutel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478393/normal_5ff5f8d66294c.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/ghcIgm4/60421696346.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/jh80Y4P/ants_canada_coupon.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/8sgha0Q/glow_draw_app_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380691/normal_5fcf975645122.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/ghibhfi/55899281028.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445733/normal_5fdca431dfbd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_5fd1112106679.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/IThafg9/slitherio_videos_play.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/jhjgfM6/pomada_mamitol_para_que_sirve.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/hIJjfhj/zamowutajenotoruli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409411/normal_6041c1e09abcf.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/iaihjbj/company_survival_manual_ffxiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_910d5de5d1474f75850020bc23c679ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fd43cb-19b5-4595-a18f-82684a46b8c2/ipad_mini_5_specs_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cfcffd6-a6b1-439c-9de3-a02c675f4df6/can_you_fall_in_love_with_36_questions.pdfIn PDF document text
    • http://xisokejo.rf.gd/casuarina_glauca_prostrate_form.pdfIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_4279461180f94191884bdc9f8924dff3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3485a408-0295-4747-a7d8-e2869e85d89e/dodenoja.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_ec4be168ac7948c795b25226e260d57a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39b63d2-9d72-4559-85a1-ab2f911ce310/ar_15_magazine_pouch_review.pdfIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_e11c7145dcbe419cb32465ad9f1d3a88.pdf?index=trueIn PDF document text
    • http://dukidejulorib.epizy.com/borewobimobam.pdfIn PDF document text
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_b1d5d8b07e0744a4bcce8ad2d6cb0056.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 5348 bytes
SHA-256: c1e72cc343736600cdafc93d2275997f08cec7fd7fbb87c9c785a814855f1362
font_01_sfnt_off0000ff4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4F 10620 bytes
SHA-256: 0446a22dd17d364d76cbd0c1fd6ad1dc3b8eaede11e289e613902e6e2f104617