Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2b1186e026373d…

MALICIOUS

PDF

84.2 KB Created: 2021-05-17 22:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6779343d90c5a52536b2d70c798fb53a SHA-1: 29683730bc853419993cb2a8ef773a9289a24da9 SHA-256: 0a2b1186e026373da7998f64e56839911f2316fa9d593ea21a3536e71b334225
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'zajinet.ru', which is flagged as a link farm on disposable hosting. ClamAV and ML classifiers also identified this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to redirect users to malicious content, likely as part of a phishing campaign.

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://zajinet.ru/strik?utm_term=how+to+use+infrared+foot+spa
    • https://cdn-cms.f-static.net/uploads/4388617/normal_604ce6df1e714.pdf
    • https://bewabolome.weebly.com/uploads/1/3/5/3/135347927/deca77.pdf
    • https://sitepofom.weebly.com/uploads/1/3/1/4/131438718/laxuzajonosixes_gumebutejuge_xinox.pdf
    • https://cdn-cms.f-static.net/uploads/4427780/normal_601b8d9d99d72.pdf
    • https://gulezawajure.weebly.com/uploads/1/3/1/8/131858287/nusofejifutol_xoxeneregiwa_wedunutuv_jirevado.pdf
    • https://digexuvin.weebly.com/uploads/1/3/2/8/132814990/xugula_xobopefebese_nofezokel_jitixuwaki.pdf
    • https://fugogifozu.weebly.com/uploads/1/3/4/8/134888696/dajiladametexuguro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c92d9190-ee71-4ba3-aa17-91d82a2baa89/english_parts_of_speech_with_examples.pdf
    • https://s3.amazonaws.com/xuzed/high_resolution_audiophile_music_free_s.pdf
    • https://s3.amazonaws.com/bokexizometun/wezejemaxopu.pdf
    • https://s3.amazonaws.com/gapuruxumeg/dell_optiplex_960_memory_maximum.pdf
    • https://uploads.strikinglycdn.com/files/94363c43-c616-4096-8560-efd409eced82/4910990661.pdf
    • https://uploads.strikinglycdn.com/files/02ea33b5-703c-40e6-8360-22f2978a8973/36026844434.pdf
    • https://s3.amazonaws.com/zodererezuzuxi/facebook_reports_q3.pdf
    • https://uploads.strikinglycdn.com/files/f304a549-18f4-4f5d-ab0b-5e85cfba8bc2/who_makes_intertherm_furnaces.pdf
    • https://uploads.strikinglycdn.com/files/85841faf-fa34-47fd-adf9-3cd453daf1ac/25642102257.pdf
    • https://s3.amazonaws.com/satuja/saeco_-_xsmall_vapore_2000_super-automatic_espresso_machine_-_hd8651_14.pdf
    • https://s3.amazonaws.com/juzewojavomofew/38643819354.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_off00010f28.bin
f4e22d2fc07d603fa9d14e91da1f6f29dbf7496ff3462cd00ac29bfb432883d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F28 5056 bytes
font_01_sfnt_off0001207a.bin
24d740cef7865dbab8a3370b7ce153fceb956082b4857052854b49635b1f6e71
pdf-font-stream PDF embedded font (sfnt) at offset 0x1207A 10524 bytes