Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe86df1440f225e…

MALICIOUS

PDF

80.6 KB Created: 2021-04-19 08:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 21a1c5e3655c8f48242a7871ee0ee00c SHA-1: b0831d7d6b993a0bb9c92e4ee3a49e654f7016d7 SHA-256: cfe86df1440f225ec16585d0977a18e88d71e7c15e78b47b9e9ecd773e0d72ad
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://ponafet.ru/strik?utm_term=amtrak+california+zephyr+smoke+stops PDF link annotation
    • https://cdn.sqhk.co/dofexoxev/iegegii/bofed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5fd2fa59e50c3.pdfIn PDF document text
    • https://cdn.sqhk.co/rudugebakivo/fvggQjh/greenworks_1800_psi_pressure_washer_lowes.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/ziroxarazovefad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413231/normal_5fda4e7f449c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451955/normal_6067db173b1d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503525/normal_5fe6cdf97da59.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/ji2ozgc/red_lobster_endless_shrimp_2020_texas.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/best_ebook_reading_app_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_606a9e10412a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bfbe0c1-7282-46f9-9e48-67960c68556a/finite_element_analysis_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e697bed-3465-4bf6-93db-6727e27444c4/motorola_two_way_radio_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/94473711648.pdfIn PDF document text
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_684297019f3744deae471e055f7aa927.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupebesu/starting_your_own_clothing_line_online.pdfIn PDF document text
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_284e138b0b214ebfbf619f8dacb732ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/721c45ae-a110-4b16-a01f-4b38bd734658/vujanabotogazorudutoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/maytag_epic_z_washer_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e91c18c6-4864-48dc-a411-85ad34db5723/43632885767.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/zazedipimijode.pdfIn 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_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 5460 bytes
SHA-256: 61dfaa7598066a84c83a550bceb5fbcd41f5f314ab236503e6a32c9bdcbf0562
font_01_sfnt_off00010f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F38 11068 bytes
SHA-256: 7133f699a6d2fc69dd6ad23e05a2ddbb1987a07b545d405f71a2ac2e299d8edb

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