Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1259ec6e6fe1ce…

MALICIOUS

PDF

75.8 KB Created: 2021-04-16 15:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9992557ac84f76f90bbaa994596fbf81 SHA-1: 04f5ffa637faec51addd6e62269a69df4928832c SHA-256: 0a1259ec6e6fe1ce01ed4d4cb65a3c69845a5a36f3888ebbcdb89397937de351
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection scheme to deliver malicious content. The document body, though partially corrupted, indicates a lure related to 'research report writing'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/strik?utm_term=major+components+of+research+report+writing
    • http://bigowet.xyz/vomimemagifepvhenj.pdf
    • http://lalashoppen.online/mekagoradv9z7.pdf
    • https://cdn-cms.f-static.net/uploads/4479678/normal_605f888de6ddf.pdf
    • http://usesalle.xyz/jujezisomapajud8xi5d.pdf
    • http://badge-verification-center.com/recliner_mechanism_lazy_boy_electric_recliner_parts_diagrambt164.pdf
    • https://static.s123-cdn-static.com/uploads/4379602/normal_5fce5cad530d8.pdf
    • http://nolaxevoxuvelij.iblogger.org/nature_beautiful_wallpapers_free.pdf
    • http://tvoeobrazovanie.fun/ates_ve_su_11_oyunu_oynaxm7fr.pdf
    • http://tapadobav.iblogger.org/ruwozilosaderulolumi.pdf
    • http://changepass.online/9685482621oj1ih.pdf
    • https://cdn-cms.f-static.net/uploads/4451227/normal_6011433ab5e3c.pdf
    • http://pshcomonhere.xyz/10072874847fw6lj.pdf
    • https://cdn-cms.f-static.net/uploads/4457320/normal_603ed030cf6f4.pdf
    • https://static.s123-cdn-static.com/uploads/4495839/normal_5fc8f2a140ef8.pdf
    • http://meblik.su/moves_for_mortal_kombat_xl202g0.pdf
    • http://soinjaga.ru/44651959979cdvmb.pdf
    • http://zoneeuro.pro/naxajobx8gj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_d203b8b5c2f4447cade8da191df5591f.pdf?index=true
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_99265fec3c4e49c8ab2a1064319f4e74.pdf?index=true
    • http://takolonopafa.epizy.com/simple_present_perfect_worksheet.pdf
    • https://2a26c5f8-c4f8-4af8-830b-7e2c9961bd8e.filesusr.com/ugd/2e4362_fea5d4d3635a4888a2b8f92fe1ec6158.pdf?index=true
    • http://jojomuge.epizy.com/recurrent_aphthous_stomatitis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebcf.bin
826d042db1dd41746447cf734d838613161d44f89467a8e1415a02d65e19da05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 5568 bytes
font_01_sfnt_off0000febe.bin
98369e532c29428ab11762cff072d50b816e1f7c2346fdbcb7bad29efcb9a91d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 10156 bytes

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