Malicious PDF — malware analysis report

Static analysis result for SHA-256 6599f27bda37ddcc…

MALICIOUS

PDF

71.8 KB Created: 2021-04-07 07:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a725be991a5ca6967b43bde4949f015f SHA-1: 7d06516049326804a1ce0879aac6aff84a929dbb SHA-256: 6599f27bda37ddcc485e1df14e688cde503e3150ebd988a81d2886667311d9ad
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to distribute malicious content. The presence of these links suggests an attempt to redirect users to malicious sites or download further malware, aligning with a phishing or trojan delivery pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/award?keyword=wordly+wise+3000+book+7+lesson+14+pdf
    • https://static.s123-cdn-static.com/uploads/4449771/normal_5fc5ee68675b4.pdf
    • http://new-leggins.site/nts_kp_tevta_application_form_20191qbwk.pdf
    • http://crystal-light33.ru/jibuvobewapevagog7e0nz.pdf
    • http://burrrhey.tech/19511721896yhxoi.pdf
    • http://gratoramaa.website/lipid_profile_definitionn0w1a.pdf
    • http://libutulidux.medianewsonline.com/83707651254.pdf
    • http://kepukarob.sportsontheweb.net/45193690272.pdf
    • http://boost-shop.xyz/5e_shaman8dzwe.pdf
    • https://cdn-cms.f-static.net/uploads/4495039/normal_60283a2e17830.pdf
    • http://pigokakiw.iblogger.org/rutowabo.pdf
    • http://lotibamuzuti.scienceontheweb.net/21041315370.pdf
    • https://cdn-cms.f-static.net/uploads/4479213/normal_605b3a1f40577.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vujapoguxesak.myartsonline.com/11167417737.pdf
    • https://uploads.strikinglycdn.com/files/631fcd2c-113c-484a-a57a-b20cf6754a9e/ghost_boys.pdf
    • http://bopubedoru.myartsonline.com/alter_ego_b1_plus_gratis.pdf
    • https://uploads.strikinglycdn.com/files/9acb1a6a-7552-4809-bd7d-1d2b94cc3d64/6634513385.pdf
    • https://uploads.strikinglycdn.com/files/0e98b440-be2e-41b9-acd9-e72f9387045e/70985872893.pdf
    • http://zikepodaw.epizy.com/72433633611.pdf
    • http://gozobemuwapu.rf.gd/how_to_create_an_interactive_excel_dashboard_with_slicers.pdf
    • http://tenovelipa.rf.gd/dadakiduk.pdf
    • https://uploads.strikinglycdn.com/files/090c0337-f4b5-4583-acf3-6b0c3fb22a9e/where_to_buy_replacement_parts_for_waterpik.pdf
    • http://xewepipesu.epizy.com/bharat_ratna_award_list_download.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_off0000d57a.bin
7490384fe3b098bf55e91db9adf8b57b44da1eacf1b2a1f0f85c9f15f78b55d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD57A 5760 bytes
font_01_sfnt_off0000e956.bin
103b267d7e3621264dfe8e0aeb4672116af5d667b7c42cf0d4802811cd0d818a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 11592 bytes

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