Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e83f4a426d7ee23…

MALICIOUS

PDF

76.1 KB Created: 2021-04-01 05:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 42c683b8316b44daaf32490f70a66e5b SHA-1: c6345314004080d51338bff11fdeec0653ea6a06 SHA-256: 4e83f4a426d7ee2307e4a1a893f57acb764ed0cc80a2dc4e97d9218dc0ffd771
166 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a notable one pointing to 'bologen.ru', suggesting a phishing or malware distribution lure. The heuristic 'SE_LOLBIN_RUN_COMMAND' and the presence of embedded URLs further support the attack pattern of directing users to potentially harmful external resources.

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://bologen.ru/wix?keyword=home+fire+escape+plan+pdf PDF link annotation
    • http://nuloriwilorij.scienceontheweb.net/svb_bls_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/LqMyBhj/spirit_airlines_phone_number_855.pdfIn PDF document text
    • https://cdn.sqhk.co/boxadiweteve/ihicmdW/rome_total_war_barbarian_invasion_mercenary_units.pdfIn PDF document text
    • http://betmoy54.com/breaking_night_audiobook_download_freesjt42.pdfIn PDF document text
    • https://rijozixofufake.weebly.com/uploads/1/3/4/5/134509282/5084226.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/68953095744.pdfIn PDF document text
    • https://cdn.sqhk.co/negenowiji/uoijigh/79045969558.pdfIn PDF document text
    • http://1-bog.ru/1698636513w2i4r.pdfIn PDF document text
    • http://itravelimpressions.com/solar_system_for_kids-_colouring_pagespk2aq.pdfIn PDF document text
    • http://fruit-ital.space/dorotesozugunazejubobo18epb.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/21_irrefutable_laws_of_leadership_summary.pdfIn PDF document text
    • http://pressit.space/33222211948uzmrh.pdfIn PDF document text
    • https://wibabuxef.weebly.com/uploads/1/3/1/3/131380054/1821920.pdfIn PDF document text
    • http://xebubux.sportsontheweb.net/76912790663.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/34ea75da-20b1-45ca-9764-e4620327e2f8/65729743625.pdfIn PDF document text
    • http://tibutariwu.myartsonline.com/6111555318.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/81012886323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217aa695-fbbb-4139-a571-1f165185d685/pedizobepabiwaruro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9708fa34-eb6d-4cf4-be2e-b8a64cdd93d1/doxoriwenupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f01e2e-2ddf-4796-b94e-5b07f2cef797/93062753951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c1e6d4b-8fae-4bbe-88c1-51413732f3f9/is_50_shades_of_grey_on_apple_tv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 4972 bytes
SHA-256: 5c8c873535c59cfce80a386cdd4dc977d8a6247e0fd64927e6bf9d3bd30453e5
font_01_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 10272 bytes
SHA-256: aec675ea0566fcfb2691f23f9d55247b3aed5d48faabbbb73bb1b35ad7527a37
font_02_sfnt_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378