Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf4d89b8fa45df6…

MALICIOUS

PDF

77.9 KB Created: 2021-03-01 00:06:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c32a805ab9a74f54614c113050903193 SHA-1: aa4d9d06886841b16fad63c4bcd10f4eb4d34335 SHA-256: eaf4d89b8fa45df6b42fd9135a1afe9cfb29efd3502aade19659789d4b2f8819
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to a malicious site, likely for credential harvesting or further payload delivery.

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
  • 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://golowaki.ru/strik?utm_term=m5a78l-m+lx3+plus+driver PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365624/normal_6031ad42f05b4.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/hbBlFDr/supigalumoxigoguzetusoni.pdfIn PDF document text
    • https://faxexivironi.weebly.com/uploads/1/3/4/0/134042341/pexed.pdfIn PDF document text
    • http://pogogimuz.iblogger.org/wobuvobupuremut.pdfIn PDF document text
    • https://pizupunaj.weebly.com/uploads/1/3/1/4/131406403/870671f2c.pdfIn PDF document text
    • https://lixudovu.weebly.com/uploads/1/3/4/5/134598000/tegopagabinexusafi.pdfIn PDF document text
    • https://cdn.sqhk.co/bipozipo/ayzhjgi/14393537744.pdfIn PDF document text
    • http://mafewagidimu.22web.org/the_selection_book_2_free.pdfIn PDF document text
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/b791494b7a568.pdfIn PDF document text
    • http://hookup157.fun/radizatasz0ka3.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/la_casa_de_bernarda_alba_abriendo_puertas.pdfIn PDF document text
    • http://sodalabs.pro/noximugidoxomumukuzuwir1mc9l.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://dudoluv.rf.gd/tom_clancys_rainbow_six_siege_psn_store.pdfIn PDF document text
    • http://dipuvomefig.epizy.com/10497059185.pdfIn PDF document text
    • http://wozimape.onlinewebshop.net/how_to_draw_self_portrait_in_illustrator.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/springfield_ar_15_stock_kit.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_off0000e533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE533 5420 bytes
SHA-256: 551f1bb473502d6122a4f9f43fbe92a2af0fb8c6be0e786cc4846997d344b99d
font_01_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 11020 bytes
SHA-256: 47d2ee724c79ea03826a4d278c233352653c92b2e51b7a1a79e97b682d93f31a
font_02_sfnt_off00011c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C25 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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