Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2603f84565c9cbe…

MALICIOUS

PDF

76.8 KB Created: 2021-03-12 17:32:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1f533e0b6d5108729d88a0a68f2c1c3b SHA-1: b1cd6b519b7b4cce0fea2cdfdfbdcdaab8927a8a SHA-256: c2603f84565c9cbe26d539eb79d5d8f10f15f677c2c1afb7dbeb284ea6a7a36b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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://seumenha.ru/123?utm_term=cabal+online+mobile+apk+english PDF link annotation
    • https://cdn.sqhk.co/goxoxasopus/hjjgcgf/super_adventure_rockman_english_patch.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/gFtMiiL/dinuziwotovawuvalazifunef.pdfIn PDF document text
    • http://iclod.tech/common_core_standards_california_math_3rd_gradeeaarf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5fd879443fc39.pdfIn PDF document text
    • https://cdn.sqhk.co/tawunipufop/cjeMsgc/luwerovuwufi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388169/normal_5ff5084c5b334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530990/normal_6047fe7d92a88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408851/normal_5fdf2adeb3882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459631/normal_602b9966380fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422137/normal_5fd2dcb0d24ef.pdfIn PDF document text
    • http://ladyso.ru/cftc_form_dcodwu8m.pdfIn PDF document text
    • http://topplafond.xyz/343183581167tytt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467912/normal_603399ec57bea.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/iaatjbz/commuter_rail_map_dublin.pdfIn PDF document text
    • https://cdn.sqhk.co/zosurinipin/iaibuO6/best_road_trip_games_apps_for_adults.pdfIn PDF document text
    • http://hh666o.site/out_of_the_loop_rooster_teeth9irk5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495402/normal_5ff40d9e10d2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_b11301c41c31452c89118285a816d368.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_50f40062df254de5a4b2770d19bb22c1.pdf?index=trueIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_e3ddccd770d24daa9d76106a99d489a0.pdf?index=trueIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_348f527760c74bdb92df147fa1d2c5ce.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 3552 bytes
SHA-256: 2a6cf772668a3c6818af187b858a480d2aaeaa1275837f7c5c0d818b824da33f
font_01_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 5248 bytes
SHA-256: 5a08a288eb7823340a68876ac380a3c7c14756447aab803ec9a824d6e1291509
font_02_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 10444 bytes
SHA-256: 24fe368e989861d61e10cfd2d059b22d48c13f9ee04bd88d857ab6bacc9a34d6

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