Malicious PDF — malware analysis report

Static analysis result for SHA-256 5805957df27fb1f5…

MALICIOUS

PDF

91.2 KB Created: 2021-04-03 11:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 356a74b578076998ebc41d102e7baf83 SHA-1: 346361171fc750de70b63877292696e6e9b5db02 SHA-256: 5805957df27fb1f5ba48ce64fe62c2771d4153b14a447a6ea5205846e45ca769
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/strik?utm_term=how+to+train+your+dragon+2010+end+credits PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427097/normal_60167099c413c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_603311b800e6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488317/normal_6060b58e9e5cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444378/normal_604d7ac0e89f7.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/qWoX8ic/cod_warzone_2v2_gunfight_tournament.pdfIn PDF document text
    • https://cdn.sqhk.co/boremagu/mbCjjgg/badminton_information_in_marathi_language.pdfIn PDF document text
    • https://cdn.sqhk.co/lezebulodiw/jjbhjhg/business_tips_from_successful_businessman.pdfIn PDF document text
    • https://cdn.sqhk.co/vumojakizaw/gRsjfgd/baby_yoda_phone_meme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412164/normal_60134d0f82487.pdfIn PDF document text
    • https://cdn.sqhk.co/rovonoset/bbeDHPy/68636493717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_60205282bbc27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_606228a27998a.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/fukepez/kohat_cement_annual_report_2016.pdfIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_3845f1563594447d9a3402dbc7d77b26.pdf?index=trueIn PDF document text
    • http://dumatefofexulen.epizy.com/arqueologia_biblica_pedro_cabello.pdfIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_9037ee54eb3b44e1831677f3b8325b4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegebunov/87016621847.pdfIn PDF document text
    • http://gudelapomopovu.rf.gd/revifavoregekapumem.pdfIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_9935c3b9a1fb4ff4814adf3ae04918b3.pdf?index=trueIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_5f870ff3cc24401e84e19bc7a9703994.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xozeb/garments_factory_project_report.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014357.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14357 17392 bytes
SHA-256: d08ec50531fee31707250c54d3d1c09ff706bc71e0b97af24826ad4c28f812b9
font_00_sfnt_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 5556 bytes
SHA-256: 278b3bf4011383a3b5cf8b17982235db634ba58049385fb559d144f9fcf8f293
font_01_sfnt_off0001193f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193F 12420 bytes
SHA-256: 3e4a241cb92ad87ffea61eacfc81d373457aa0c86bb0d1fd8764e739a73af54a