Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1b77f07e5033f7…

MALICIOUS

PDF

79.3 KB Created: 2021-03-09 17:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d46fecf45544d032b2e8dd6c4465b031 SHA-1: 75bb985cb482c0fa4d39f74223b0b18534e5b338 SHA-256: da1b77f07e5033f75c34828ab55e0aae9a6327237492cbed4582fd7bf4f72804
166 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent URL pointing to a domain associated with phishing lures. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the presence of commands that could be used to execute malicious code, potentially via JavaScript embedded within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=tutoriales+para+aprender+a+tocar+guitarra+acustica
    • http://mojadejazisapa.sportsontheweb.net/90783746830.pdf
    • https://cdn.sqhk.co/furafurume/jFhehj3/the_walking_dead_season_2_important_choices.pdf
    • https://cdn.sqhk.co/tuvameboroke/Iicifx0/62494284136.pdf
    • http://limaxinsto.xyz/el_arte_de_la_guerra_maquiavelovaajo.pdf
    • http://winoraama.space/vupib46daw.pdf
    • http://maewallace.com/how_to_fix_wahl_trimmeredoxj.pdf
    • https://demuxovepeb.weebly.com/uploads/1/3/4/3/134311881/valunaratup.pdf
    • https://girusidopot.weebly.com/uploads/1/3/0/7/130738876/b566dfd85f.pdf
    • https://cdn.sqhk.co/rasepotobami/ifMBfge/xonadamijita.pdf
    • http://cyberlife.store/zinaxegosobulimikexe5kse.pdf
    • https://vominitaxa.weebly.com/uploads/1/3/4/6/134677623/da883be1c0491.pdf
    • http://logunej.iblogger.org/doubledown_casino_slots.pdf
    • http://cenderaoriginator.com/kimowegiragudezufeppwsh.pdf
    • https://berapiginufar.weebly.com/uploads/1/3/4/3/134316450/nojajenawanumola.pdf
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/wuxalefe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c91f9a85-992f-45d4-95d6-3397ae324277/62842048394.pdf
    • https://uploads.strikinglycdn.com/files/bdcf83e0-003f-4dc6-b195-ba3d77b8ebe6/rimuro.pdf
    • https://uploads.strikinglycdn.com/files/1d9f2c68-a594-4d06-b6bf-c26aa82aa06c/maus_a_survivors_tale_vol_1.pdf
    • http://latujetob.epizy.com/telugu_christian_bible_movies.pdf
    • https://uploads.strikinglycdn.com/files/eee368ff-6d76-4a2d-b255-a971ca6efa7c/volos_guide_to_waterdeep_dragon_heist.pdf
    • http://vidugozu.atwebpages.com/10458074344.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_off0000f652.bin
23e2d20634d6088ffbf1bf7f630c6ea17f1b2986a8ba267ba91d6b98b7f11e9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 5192 bytes
font_01_sfnt_off00010804.bin
835a5e3a900ed60af5088319b8b0d9db260c8348a6a838ceea8d3bc0ffd9c425		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 12188 bytes

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