Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca5a525629f93bf…

MALICIOUS

PDF

74.8 KB Created: 2021-04-06 14:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f2bbf838b456676566990e6c83226c69 SHA-1: 0038fa4afa5d2b089d39d94b9562570f7cabd995 SHA-256: dca5a525629f93bfa9f893f173ce9edbb4254d4ad4f58df4d06681a0d0dcda95
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=transformation+rules+reflection+over+x+axis PDF link annotation
    • https://luroxonigin.weebly.com/uploads/1/3/1/4/131406321/sumexitajufafen_xozujujafumowe.pdfIn PDF document text
    • http://farvestnn.ru/99691937944zfxcv.pdfIn PDF document text
    • http://martakkord.ru/wujijebetixew0qsnb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386605/normal_6053ab8a07c6a.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/3355419.pdfIn PDF document text
    • https://wanesibib.weebly.com/uploads/1/3/4/5/134591449/3799022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5fda8ab7246f0.pdfIn PDF document text
    • http://resimpub.com/escort_9500ix_platinum_review1r8uo.pdfIn PDF document text
    • http://qlemelest.online/lemiputipopagenexujip6uu5.pdfIn PDF document text
    • http://nukanewejej.22web.org/ctet_2020_syllabus_in_telugu.pdfIn PDF document text
    • https://kulabukotijol.weebly.com/uploads/1/3/4/7/134703535/151125.pdfIn PDF document text
    • https://nugazemagutum.weebly.com/uploads/1/3/4/3/134346004/lokofemi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pexitiwe.epizy.com/bilaspur_university_admit_card_2019.pdfIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_e3274c898b15406885ea776f78b224b6.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_a5b6e7b9563f494194ca07fec581a2d4.pdf?index=trueIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_8e9687ddfe8e4dcf85b6541afe31bb4e.pdf?index=trueIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_85aa4f5875e34a2aa0e185f4218ba14d.pdf?index=trueIn PDF document text
    • http://bokapakubab.epizy.com/what_schools_offer_interior_design_majors.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_off0000e5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 5104 bytes
SHA-256: a2eca0000ce9ffa545f6682a6992dcb98baf4235c8374876d1858b4b307f4c1a
font_01_sfnt_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 11452 bytes
SHA-256: d22a2da689bbad2d6311341db28014a24125529ab313b60fbabd9a417cfde8b4

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