Malicious PDF — malware analysis report

Static analysis result for SHA-256 59461b6cc0b8deef…

MALICIOUS

PDF

70.8 KB Created: 2021-04-14 03:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d7a02d6a8cfd61129ef4e64267586337 SHA-1: ef4cfbf5842d7c0070562452a493d658e8554e66 SHA-256: 59461b6cc0b8deefb7e3c4ad9f0f5d7c6860b1177ec1973c449659951b97e2ab
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains a title related to router reset, which is a common lure for technical support scams or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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+reset+arris+sb8200 PDF link annotation
    • http://jilet2.club/kovozidovoxi68dd4.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/jGXKCjf/paruzowowa.pdfIn PDF document text
    • https://cdn.sqhk.co/webegodebav/iRaLYhi/definition_of_conflict_by_different_authors.pdfIn PDF document text
    • http://crysety.xyz/bolajixobajaxagaforioqt2j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450048/normal_5fdc9b0a4183e.pdfIn PDF document text
    • http://oneitstore.pro/financial_reporting_system_components1l6f7.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/beijcdX/78979925170.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/a2b2eFa/smash_gamecube_controller_adapter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_6010fa6754da5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/linux_command_line_interface.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_e42780b17950475ba5b63e23e1d2e67b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41b9e5c8-cca8-44f7-8a34-1acbc65f06fc/gokobawojodetem.pdfIn PDF document text
    • https://0a9dc515-c6d9-419f-b4de-d801a8c2a39b.filesusr.com/ugd/760a4c_7b51b23f9b7b4d768e196b43d4f19708.pdf?index=trueIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_94aca2ceebf446aca8d6da26bac8f8b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26adacb5-9796-4440-a59a-981b8a25c657/the_secret_dare_to_dream_family_rating.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/chamber_of_commerce_karachi_form.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_c460709794194737ae47a6880ad3c783.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sewamos/crazy_train_sheet_music_viola.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/rarugozomavapu.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_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 5308 bytes
SHA-256: e9ae271ba52afeb059ff87e1213c6c8488c3d9c20bc4f4a1012acea69ec671d5
font_01_sfnt_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 10860 bytes
SHA-256: 843897fe9ea02cca317455c9363005d20fae3221ac35bb26cdcd0185d4a16c79

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