Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd9bfff41e2e24f…

MALICIOUS

PDF

73.6 KB Created: 2021-02-24 22:25:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 95f6e846ff737a227dbb192456c5e129 SHA-1: 9ec5319336ca534c72bf12dd9f4f02d4349d7509 SHA-256: 1fd9bfff41e2e24f61b634daa8abf3934e15473ecb9651c39c8f797861e836c7
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting and acting as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern. While no scripts were explicitly extracted, the presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=how+fast+is+the+axial+yeti PDF link annotation
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/zibegibebajebuw.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/4990309.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/descripcion_psicologica_de_los_personajes_cronica_de_una_muerte_anunciada.pdfIn PDF document text
    • https://nenusobodi.weebly.com/uploads/1/3/1/4/131406558/5256118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426080/normal_602c9001da7f8.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/3._what_is_the_central_theme_of_the_poem_the_road_not_taken.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_6030ecdbcad1d.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/84636871368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_6033bf63991a8.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/nupesilokaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujuvisesakok.myartsonline.com/how_to_light_pilot_on_williams_wall_furnace.pdfIn PDF document text
    • http://nununad.myartsonline.com/excel_vba_range_find_multiple_criteria.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/why_does_my_polaris_280_run_on_its_side.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/how_to_hook_xfinity_cable_box_to_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 4984 bytes
SHA-256: 4833dbd97233cd10f06d93e0ed48b9876060c1c883408384b796052ccd788f67
font_01_sfnt_off0000f2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 10868 bytes
SHA-256: 8138bb81614ae053941c8f41e9787b15b1f64fda8deb8b2b4286587b119d595f

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