Malicious PDF — malware analysis report

Static analysis result for SHA-256 0534837e5965f943…

MALICIOUS

PDF

78.7 KB Created: 2021-04-15 04:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7973c2ccb4fa70b03fdce737d8120d84 SHA-1: 61366f60faa7453c41b40089ae6fef6012818f8c SHA-256: 0534837e5965f9433f456f5239bdabeda50a1cd37a2e5aea811fb2db72f37c24
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a URL pointing to 'nipisod.ru' with a query related to car starter reprogramming indicates a social engineering lure.

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://nipisod.ru/strik?utm_term=how+to+reprogram+viper+car+starter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479237/normal_600ef4965dd4c.pdfIn PDF document text
    • https://mamonaxerif.weebly.com/uploads/1/3/5/3/135347384/totizosu-poxifez-wodenur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409255/normal_5fe6a6583f9aa.pdfIn PDF document text
    • https://gegilegaf.weebly.com/uploads/1/3/1/3/131383227/suwekerekuvud-taruka-fojixaro-zifajazadu.pdfIn PDF document text
    • http://weinmvc.net/689001547341j757.pdfIn PDF document text
    • http://regse.website/subhash_kashyap_our_constitution_download8vmyb.pdfIn PDF document text
    • http://khanapoorti.com/thermaltake_core_v21_buildfcufi.pdfIn PDF document text
    • http://organicsss.space/bipawigubh3ps.pdfIn PDF document text
    • http://ipoteka.net/36763236931ug3n8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d58962f-c9ff-40cf-b288-af6f1715c19c/porter_cable_150_psi_air_compressor_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/sex_and_the_city_2008_ending.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0f9c267-dede-47ca-8d83-67cb28fb396c/lezofa.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/westworld_season_1_episode_1_parents_guide.pdfIn PDF document text
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_5be5038fbf0c4b57a8c73ac91b3f212d.pdf?index=trueIn PDF document text
    • https://f3b86e06-b3aa-4ee1-82f7-79049f3379a8.filesusr.com/ugd/0c4fd2_214da9cdeefe4b2797f9c9f38dcd31be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/arafat_dj_music.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_755a5f9e7b5e4fdca21704a612765b03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d88217-dbe6-43ff-8660-e3be05fd4cd2/36140789968.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/how_to_load_a_bell_and_howell_super_8_projector.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/marcapasos_temporal.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_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 5332 bytes
SHA-256: 1343890b997a5993772b08bc648c870bd8b4d6e545dc201d578d538226c1dff7
font_01_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 10936 bytes
SHA-256: 725fb7d7b3e7a2c6cb7afc6bcaeb47156e96348852fed9f4489603b9c656dc51

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