Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8121ccdf0eb240a…

MALICIOUS

PDF

77.7 KB Created: 2021-03-16 21:06:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4498f05e5ad2d0bed427f52a08ff509 SHA-1: dde570c0bb2b0b48eee2ae8b02e43193a2ac3094 SHA-256: e8121ccdf0eb240aeff6f27bc2ecaa84b39792273a3f0e459df671c609ff4e2b
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and disguised as PDF files, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of 'cmd0rxo2.pdf' in the document text and heuristics suggests an attempt to disguise malicious content or exploit commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://nipisod.ru/strik?utm_term=denon+avr+791+zone+2+setup
    • http://f13x.xyz/how_to_list_all_devices_on_network_cmd0rxo2.pdf
    • http://filemarker.store/7600209743nb6y7.pdf
    • http://naturebiolog.fun/cost_structure_garment_industryhezjm.pdf
    • http://on-arenas.com/mt_power_drumkit_2_keygenzbong.pdf
    • http://wejowadizabudex.mypressonline.com/technics_sl_d20_turntable.pdf
    • http://pinegobojefo.getenjoyment.net/91808946697.pdf
    • http://rajonilelubej.22web.org/simesejijur.pdf
    • https://cdn-cms.f-static.net/uploads/4420431/normal_5fdb707580e1f.pdf
    • http://sitebomobegux.sportsontheweb.net/jusot.pdf
    • https://cdn-cms.f-static.net/uploads/4389095/normal_604e7dd858390.pdf
    • http://womenalikumat.22web.org/jetojebemuvupeba.pdf
    • https://cdn-cms.f-static.net/uploads/4374362/normal_5fe713e75a3f7.pdf
    • http://dizititakozazi.mywebcommunity.org/blues_for_mister_charlie_character_analysis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tinajabizoreguf/latovunexira.pdf
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_1c072419eb3844588a022b6f6a279c6d.pdf?index=true
    • http://metowovukijipu.rf.gd/54641934059.pdf
    • https://s3.amazonaws.com/lixuduwonifa/kibew.pdf
    • https://s3.amazonaws.com/nigimul/small_side_table_with_metal_legs.pdf
    • https://s3.amazonaws.com/xulikamul/integrated_math_2_answers.pdf
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_6c8580c16cb44e44ae68c4cd904d7759.pdf?index=true
    • http://ferogexomemu.rf.gd/chitarra_acustica_ibanez_performance.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/
    • https://s3.amazonaws.com/tinajabizoreguf/latovu
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e341.bin
4256ebb256655c44726370ab6c003bdffe77b56eef1e3d4aaa79181e7566588d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 5144 bytes
font_01_sfnt_off0000f4e6.bin
0fb474399553c5d3f9dc573d6a16c036bdab1f91c3ce1dcddb4c467822292d7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 10772 bytes
font_02_sfnt_off000119e5.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119E5 4324 bytes

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