Malicious PDF — malware analysis report

Static analysis result for SHA-256 3205787d3184a00d…

MALICIOUS

PDF

96.0 KB Created: 2021-02-21 07:39:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d2735e9b695cbfef56e20c73b91a3e87 SHA-1: 5f1791e61e13d8bda19a727aabf8dd7266329685 SHA-256: 3205787d3184a00daabdeef808edcc8c20306efb8ce37756c6659e0d45890471
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious or phishing websites, and the PDF structure suggests it functions as a link farm. The presence of external URIs and the overall heuristic firings strongly suggest this PDF is used to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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://druttle.ru/wix?keyword=montgomery+tv+listings PDF link annotation
    • https://lufalejovi.weebly.com/uploads/1/3/1/3/131380058/4248509.pdfIn PDF document text
    • https://gilemana.weebly.com/uploads/1/3/5/3/135319463/c1de77cef0b0e6.pdfIn PDF document text
    • http://copyrightsupporteds.com/the_anti_anxiety_dietr4f3q.pdfIn PDF document text
    • http://update-win20.online/116603275xxbpy.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/cached_data_in_android877ty.pdfIn PDF document text
    • http://trysoda.club/20732391280h2jf8.pdfIn PDF document text
    • http://megantv.site/7447494461vfp6a.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/ggHTxRj/femewuxowixorifudina.pdfIn PDF document text
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/sifozalojotemofigola.pdfIn PDF document text
    • https://cdn.sqhk.co/gitogozune/hCuiejc/drive_simulator_2016_apk.pdfIn PDF document text
    • http://hookup756.fun/salesforce_platform_app_builder_certification_handbooktud3d.pdfIn PDF document text
    • http://winoorama.website/fijazedelasarevuxewilov1pihi.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/ejfjbiW/38464367886.pdfIn PDF document text
    • http://bluebadge-support.com/36101641954z2ids.pdfIn PDF document text
    • https://muwirejevom.weebly.com/uploads/1/3/1/8/131857435/pikizorijolagemib.pdfIn PDF document text
    • http://reliables.ru/951033989671sv2l.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/jeb5jhd/58141899481.pdfIn PDF document text
    • https://cdn.sqhk.co/figesuweno/EjiXjfa/1206968130.pdfIn PDF document text
    • http://sluzhba1.net/44774392350s6yb2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00013308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13308 4960 bytes
SHA-256: cb9393ec0accd368cd402228a9deaa7aac833cf67a2e5f6d76be2a0f7ca8a9f5
font_01_sfnt_off000143f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F1 14836 bytes
SHA-256: 9f30ee1d0aceb2777399cbf54d69d17742bff723323c43eae4a632cbc131fab6

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