Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69244d2f7596395…

MALICIOUS

PDF

79.9 KB Created: 2021-04-17 15:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 860671fcefe5e94fd8ecbb3789743fb5 SHA-1: a7b2608e1f6b395e505a6e32bbe9770b6ec31ddc SHA-256: b69244d2f7596395e443782ffa61bf71eca0f98160cc4a828f27adb736215a7a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=do+honda+odyssey+have+transmission+problems In PDF document text
    • http://rijupoxog.22web.org/tewumulapoxugerekexoron.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/how_to_get_employment_insurance_canada.pdfIn PDF document text
    • http://twoup-viktoria.online/wenoxoduz0wo3z.pdfIn PDF document text
    • http://domalitulefu.22web.org/75105263325.pdfIn PDF document text
    • http://pitushok.fun/a_storm_of_swords_chapter_22de1y2.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/0gihfi2/9th_class_ncert_maths_solution.pdfIn PDF document text
    • http://intereriia.com/vakizz07bn.pdfIn PDF document text
    • http://olivamebel.com/interesting_writing_prompts_middle_schoolyds56.pdfIn PDF document text
    • http://retamos.mygamesonline.org/pdf_alternator_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/Cgdghjt/minecraft_exploration_tips.pdfIn PDF document text
    • http://arm-watch3.club/766152382685vrxf.pdfIn PDF document text
    • http://pixell.store/nojijejowositataf1bbb.pdfIn PDF document text
    • http://wakogapenubez.22web.org/dagejozikek.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000ea47.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000ea47.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off00012450.bin)
    • http://maxumuvekem.epizy.com/36996040157.pdfIn PDF document text
    • http://livugaxoretedop.epizy.com/bepudevazar.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/vijas.pdfIn PDF document text
    • http://gozuketitara.onlinewebshop.net/91331329975.pdfIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/biw_fixture_design.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 extracted file (font_00_sfnt_off0000ea47.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 5288 bytes
SHA-256: 33e09f4ad822a4b4cff82edf921e7768702d1007fa312ceaa4d8737945afbe66
font_01_sfnt_off0000fc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 11852 bytes
SHA-256: 0f83c28e5d30c40cf990895ae3924f501da8497c8b640a334ba1922e256046fa
font_02_sfnt_off00012450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f