Malicious PDF — malware analysis report

Static analysis result for SHA-256 783b0268b17a4320…

MALICIOUS

PDF

74.1 KB Created: 2021-02-24 15:54:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 729ec0f733b21f8175ecb72d5146eced SHA-1: 05cdf9d131777aabca11e46108fa6375193df22c SHA-256: 783b0268b17a4320b7acbf4924216fa350619027ff0cc68242fae2c351d9f0fe
126 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing lure designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a search query, further supporting the phishing pretext.

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://jacksth.ru/strik?utm_term=cuanto+es+1+56+metros+en+pies PDF link annotation
    • http://tupakewufitid.iblogger.org/boundary_element_methods_in_engineering_science.pdfIn PDF document text
    • https://gideturifit.weebly.com/uploads/1/3/4/8/134887905/jiwew.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/hevaKQE/huawei_health_website.pdfIn PDF document text
    • https://semototip.weebly.com/uploads/1/3/5/3/135386148/8461243.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/nifadikufukuregosotog.pdfIn PDF document text
    • http://soxabezavusuxud.22web.org/rurag.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://lebekad.rf.gd/kenmore_gas_range_model_790_oven_not_heating.pdfIn PDF document text
    • http://fukasutatota.rf.gd/global_branding_strategies.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/wireless_n_repeater_wps_connect.pdfIn PDF document text
    • http://lenixad.epizy.com/lebukubuvevojidumazofegex.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/51534686835.pdfIn PDF document text
    • http://gijufemuvo.rf.gd/wireless-n_wifi_repeater_300mbps_manual.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_off0000d42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 5168 bytes
SHA-256: d46445340daec4148b1fbcc28deb6fc6ddff2f10dcd5c0d4e3a3b351e675aa18
font_01_sfnt_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 11748 bytes
SHA-256: c9ca278704448c5cc0d9bfee28a620357952d3d7b0733857e52e7e0b237ff368
font_02_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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