Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee1a3f443c2b0f1…

MALICIOUS

PDF

83.0 KB Created: 2021-04-18 23:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 049810b3e6b8b1979a6ba07f42ba245d SHA-1: 4a21a468a4505c9a127e430c1e7b3e7edce38f92 SHA-256: aee1a3f443c2b0f19c5745fa34955b286c07eaa2f5ec2c6b25c5d9e5981276f0
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external URIs, including one pointing to zajinet.ru, which is likely part of the attack chain. The PDF's structure and embedded links suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=dream+interpretation+dead+pet+returning PDF link annotation
    • http://bluetea.space/14103311700pw2jb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412403/normal_60054bf671f01.pdfIn PDF document text
    • http://fusobilel.iblogger.org/myanmar_business_visa_on_arrival_application_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493589/normal_6014f230278e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_60399663e0816.pdfIn PDF document text
    • http://fsbsiod.com/rosikelenyc927.pdfIn PDF document text
    • http://avto-document.site/how_to_use_my_alcatel_phone5ikxy.pdfIn PDF document text
    • http://hamlikjorettoop.ru/komatsu_backhoe_manualhqfc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453740/normal_6023d5a210082.pdfIn PDF document text
    • http://ingmijn.com/chargesheet_filed_in_498a21a90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485573/normal_6042cfc910331.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozudivigel.epizy.com/microsoft_sql_server_2014_express_sp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8a4da1-ca34-4839-aae3-531f9832d9ba/jamuvijugixegonegef.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_0859869045374ae7862b97b97bc0cc31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78653637-ad7d-4566-b49a-535d2b8fabe8/how_to_turn_off_smoke_alarm_beeping.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_2b88de8689cc4ef48e4e0c6f3cdb5e69.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_04b0b0b2837041b5bfc222e34837abf3.pdf?index=trueIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_d716eba9a85549c3bd1253b010e01c56.pdf?index=trueIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_7b22159515d44f059f0d9f3a86831173.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_8cadf81bffbe4b72ba06ee4412ec87d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f879e87a-6573-40cd-b04a-246a50f4b462/jotanokavedapexu.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_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 5068 bytes
SHA-256: 6283a05a021d914f7f4c7d903638a51f5e0af653b43d720ac6f26f99a27b7cbb
font_01_sfnt_off00011a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 10680 bytes
SHA-256: a8cfb419a25f7163afce9c6d21e2fe056cffb89cc46de50771c8041109e4afdd

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