Malicious PDF — malware analysis report

Static analysis result for SHA-256 b534f248e365ce82…

MALICIOUS

PDF

86.4 KB Created: 2021-05-09 06:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0e74a71894aafa845b14718e62ff9fae SHA-1: 3a3e71f39382cdb9a1dac4654545fe7059d8943b SHA-256: b534f248e365ce820ddd55bf44ac2c6d7676bf7b08bfd360d8da4d9fcbd506ac
186 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/strik?utm_term=zoom+g1+four+manual+portugues PDF link annotation
    • https://cdn.sqhk.co/menekilebuz/tUibjdD/weekend_ushering_jobs_in_lagos.pdfIn PDF document text
    • https://cdn.sqhk.co/raserijene/hhHieic/30951211174.pdfIn PDF document text
    • http://koxudizujan.mywebcommunity.org/principles_of_accounting_file.pdfIn PDF document text
    • https://jenamojid.weebly.com/uploads/1/3/1/0/131070605/4878115.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/jR9XOgJ/virustotal_scanner_download.pdfIn PDF document text
    • https://tewamuwomipatus.weebly.com/uploads/1/3/0/9/130969874/037c9.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/Kx5Ylhh/14487466256.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/ihalCii/xawedewuloji.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/T9lepih/pulse_pressure_definition_nursing.pdfIn PDF document text
    • https://zibitevurus.weebly.com/uploads/1/3/0/7/130776177/rebuneror.pdfIn PDF document text
    • http://gibelepij.scienceontheweb.net/amu_b_tech_entrance_syllabus_download.pdfIn PDF document text
    • https://nawuwisenaz.weebly.com/uploads/1/3/5/3/135318134/kepum-tixiler.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/gcghwjb/72026281379.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/Mjfhaji/60899311873.pdfIn PDF document text
    • https://nazugawexavidi.weebly.com/uploads/1/3/4/6/134678572/3550082.pdfIn PDF document text
    • http://tuwavetatifida.iblogger.org/bajifirupokota.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://murapimopavopa.myartsonline.com/timken_needle_roller_bearings.pdfIn PDF document text
    • http://lanobifojedepa.epizy.com/46646647685.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/cece_winans_alabaster_box.pdfIn PDF document text
    • http://zazuxidavo.rf.gd/afro_soul_music_2018.pdfIn PDF document text
    • http://tivapatovike.epizy.com/cochrane_ontario_weather_report.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/kitchenaid_stand_mixer_cover_diy.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/gatumanewon.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/88816477887.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/koribuduviguvigenulel.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/the_heart_of_change_summary.pdfIn PDF document text
    • http://fakefidefunes.rf.gd/geometry_aptitude_questions_with_answers.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_off00010e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 5228 bytes
SHA-256: c7f4e16a937fa28cf890cac58b585fb2ffef5d9e1cc643cec4ba65d16c48e45d
font_01_sfnt_off00011fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 15080 bytes
SHA-256: 9db8a609e5da3adf367f02a96a9e529831337efb61366d279490e0f518db88e8