Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b189af4b7c279fb…

MALICIOUS

PDF

82.0 KB Created: 2021-05-11 23:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 42601c4ca9b9ce00e47ec15fd9d566c0 SHA-1: 9628f31789a5dbd846095c24a893ff1305d54a00 SHA-256: 4b189af4b7c279fb64d1f8de2d62576cde18668efc5ed9ce7ea95d43fe3777ef
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9998

Heuristics 4

  • 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://gimoguvi.ru/strik?utm_term=what+is+the+end+plate+potential PDF link annotation
    • https://cdn.sqhk.co/kolokejo/Lfihsgd/49573169096.pdfIn PDF document text
    • https://cdn.sqhk.co/siboxowimu/eIFyry2/wifukavupu.pdfIn PDF document text
    • http://pirewixuzejetin.iblogger.org/tatuvopowegurur.pdfIn PDF document text
    • https://cdn.sqhk.co/tamikoveken/ifWhjHY/ikea_kitchen_cabinets_remodel.pdfIn PDF document text
    • http://nizozipup.22web.org/tenomoluludekebupub.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/mMhaiju/30542094959.pdfIn PDF document text
    • http://gafowegane.iblogger.org/65884051134.pdfIn PDF document text
    • http://tolumobibuseg.iblogger.org/nititumuxonavejanepu.pdfIn PDF document text
    • http://tidedejix.iblogger.org/gajulemapotapekizizewava.pdfIn PDF document text
    • https://cdn.sqhk.co/litazujizime/ghesthe/89263338497.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sewadereweben.epizy.com/27334213024.pdfIn PDF document text
    • http://febefijawifuja.rf.gd/38618022986.pdfIn PDF document text
    • http://dowijasimenazo.epizy.com/90300705671.pdfIn PDF document text
    • http://teboroxaf.epizy.com/integers_worksheet_grade_7_with_answers.pdfIn PDF document text
    • http://kafuxipadirates.rf.gd/who_makes_kirkland_hearing_aids_for_costco.pdfIn PDF document text
    • http://ginudamaxed.epizy.com/atlanta_braves_home_schedule_2020.pdfIn PDF document text
    • http://kepipejesa.epizy.com/abjure_verb_form.pdfIn PDF document text
    • http://walizuwimubipof.rf.gd/xezavobav.pdfIn PDF document text
    • http://rolaxaja.rf.gd/worksheet_clearing_fractions_and_decimals.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_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 4964 bytes
SHA-256: 9ce72b7835355655c6d4d2a4596af782cf5e43e53e4138da7725d6accfa03ca2
font_01_sfnt_off0001153a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153A 10972 bytes
SHA-256: b05092864d0e5e586587ffb528182feb38d9fc4f5fc0eaf5bceb6f57bdeca48d

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