Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c12dd27364bdbff…

MALICIOUS

PDF

79.0 KB Created: 2021-03-21 21:30:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 565a7f4b397938d39a6e4e2cd91ab2d7 SHA-1: 0e7a2f56e89b939cab2db747a791bf9db51a2236 SHA-256: 5c12dd27364bdbff2aa1d79fab7022a2cc4b1eb5cc4b4003b851e41709680c29
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with a primary one pointing to 'midufefew.ru', likely serving as a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to appear as a search result, directing users to a network of disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://midufefew.ru/strik?utm_term=hitachi+roku+tv+red+light+blinking PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468253/normal_603d60afc7bcd.pdfIn PDF document text
    • https://sepafolelobonel.weebly.com/uploads/1/3/4/6/134614676/6194405.pdfIn PDF document text
    • https://cdn.sqhk.co/dirotiweze/mYTPH7A/14107747156.pdfIn PDF document text
    • https://cdn.sqhk.co/fijufupuga/Eig6khe/desudiwemo.pdfIn PDF document text
    • https://rudoliretumuw.weebly.com/uploads/1/3/4/8/134861944/4465642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_60228b22e3339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464542/normal_5fe63a9a851ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426696/normal_6056a419b69d6.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/ihiajfj/adidas_sweatpants_womens_amazon.pdfIn PDF document text
    • http://sanalunuguto.22web.org/rationale_zahlen_gemischte_aufgaben.pdfIn PDF document text
    • https://jobifavizatop.weebly.com/uploads/1/3/4/1/134108852/9231305.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/dusidurominiwa_vefomeguporek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369161/normal_6039cbaf821a0.pdfIn PDF document text
    • https://nepajomawowezuw.weebly.com/uploads/1/3/4/4/134462508/40dc5ec69.pdfIn PDF document text
    • https://cdn.sqhk.co/jetobatu/StzaylE/brothers_in_arms_3_hack_apk_2019.pdfIn PDF document text
    • http://lidedapomegila.iblogger.org/26024815544.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/30661823789.pdfIn PDF document text
    • https://cdn.sqhk.co/pidefatop/jal4Fib/worldremit_top_up_orange.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
    • http://vunotafir.epizy.com/aviation_abbreviations_and_acronyms.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/8468063330.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/32880136014.pdfIn PDF document text
    • http://pegesij.rf.gd/rakovokonun.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/example_of_reaction_paper_in_apa_format.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/basic_algebra_collecting_like_terms_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/26919715212.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/whats_a_literal_equation.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_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 5128 bytes
SHA-256: d97471fe4f5e5b3e56fc9219a7062e7e0d72d0066d4734ac8d8bc1bb51f6b9da
font_01_sfnt_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 10960 bytes
SHA-256: ce31ad9e254a574f74c3e53c4b45abe20c12e73c8b0fee3e0efd22f6378d1245
font_02_sfnt_off00012038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378