Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea1d3863f85eb53…

MALICIOUS

PDF

84.9 KB Created: 2021-03-29 23:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f4168927a7202dd7c100de7e2f94d5b4 SHA-1: 88bf0dc7856f998f8cdf3b89857e2acd3055bd65 SHA-256: 8ea1d3863f85eb53c2421c3ada79a001545e1439ac0537fca345151d385848ea
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, contains metadata related to PDF creation and keywords that likely serve as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/award?keyword=cnp+vertical+multistage+centrifugal+pump+pdf PDF link annotation
    • http://tafuxasomup.getenjoyment.net/4584989164.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393362/normal_5fe0235d7f502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452621/normal_5fd1e86c81e97.pdfIn PDF document text
    • https://cdn.sqhk.co/baxajufim/csjbggz/masukoxus.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinipaz/xRRjBge/64988357461.pdfIn PDF document text
    • http://desokore.medianewsonline.com/kufizonizilaruji.pdfIn PDF document text
    • https://cdn.sqhk.co/jovakuki/chbgi1J/hearing_impairment_ielts_reading_answer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425910/normal_601e10090906b.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/libro_el_poder_de_la_kabbalah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402949/normal_6061caabcdad2.pdfIn PDF document text
    • http://gezinuduwep.medianewsonline.com/xowiz.pdfIn PDF document text
    • http://dumigegin.medianewsonline.com/maths_book_class_6.pdfIn PDF document text
    • https://migufakugiguxob.weebly.com/uploads/1/3/4/5/134579218/rudabenewoxode.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenemu/foKJTih/corleone_film_1978_online_subtitrat.pdfIn PDF document text
    • https://vubupegizisave.weebly.com/uploads/1/3/5/3/135315261/gejunelufuxana.pdfIn PDF document text
    • http://mereritijazos.scienceontheweb.net/85479638447.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
    • https://s3.amazonaws.com/sojuravewi/pusomunekago.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/datediff_crystal_reports_exclude_weekends.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/musepodajifuzibaj.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE840 5328 bytes
SHA-256: 3cce21ff9327a3695fc0c571489fce9f4ca64119c223c1285e032def245c8359
font_01_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 11780 bytes
SHA-256: f5d7b1ac67985dc47ec2861b37335c36289dc74024e21b965f5f80de0eaa69b5
font_02_sfnt_off00012288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12288 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1
font_03_sfnt_off000137a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A0 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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