Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e2dfe3083f663d…

MALICIOUS

PDF

78.7 KB Created: 2021-02-26 02:26:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 92ef3b76fc7f650ff9804117902ef1d1 SHA-1: dad95ba1aab5b63d59c8c6a782548d5da79c72da SHA-256: d2e2dfe3083f663d3fe42dbe199cf6cc080aeca83e58d323ca598df2541940dc
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, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous external URIs, many of which are on disposable hosting and utilize UTM parameters, suggesting a link farm designed to obscure the true destination. The document body, though heavily obfuscated, contains metadata related to PDF generation, and the presence of external links points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=samsung+smart+tv+user+manual+download PDF link annotation
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/a467543dec4583.pdfIn PDF document text
    • http://sreda.city/panasonic_plasma_tv_red_light_blinks_13_timespcfqo.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/ibKOxHm/zawuwefepaput.pdfIn PDF document text
    • http://helpcreditscore.info/435227491400c2gr.pdfIn PDF document text
    • https://fifukujujaki.weebly.com/uploads/1/3/2/6/132680890/1723898.pdfIn PDF document text
    • http://6gusevshop.website/din_shagna_da_song_download_mp3xq3y4.pdfIn PDF document text
    • http://dompodklyuch.com/metodologia_do_trabalho_cientfico_lakatosv1xwz.pdfIn PDF document text
    • http://arm-watch1.club/android_linux_kernel_development_tutorial4k5c6.pdfIn PDF document text
    • https://fabezetenonuke.weebly.com/uploads/1/3/4/8/134846610/zukujajanifa-lukoduwitexat-kaxodenarixino.pdfIn PDF document text
    • http://presalon.xyz/d_d_3._5_perfetto_arcanistamacnb.pdfIn PDF document text
    • https://mozeduxazos.weebly.com/uploads/1/3/4/0/134018133/273147.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/3747516.pdfIn PDF document text
    • http://usacreditreport.info/jefovonexiligezewiusibm.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/what_are_the_specials_at_subway_today.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ralirajuz.atwebpages.com/what_is_data_management_skills.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/3rd_grade_english_worksheets_free.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_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 5400 bytes
SHA-256: 42cb28c9b287a0c972ad3b2c48b01a36166a7ded67363133df43d40fda1d6e14
font_01_sfnt_off00010983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 10564 bytes
SHA-256: aa94bf5e88d61dc131ba1b501a79460b512c4bc7552b368cc5779d71d2cabd18

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