Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc07632c96c0dcee…

MALICIOUS

PDF

76.8 KB Created: 2021-05-05 18:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5e49346472c42e1752e5cfe4ec9ba5db SHA-1: 158abd148ca3692dc783c6d6c1fbe625aa4a4875 SHA-256: bc07632c96c0dceef7729391c23648a7df03dd345c30fe697404750c4ef9eff6
226 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. It uses a password-protected-archive lure. 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 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kuzutuzo.ru/strik?utm_term=how+to+reset+kindle+touch+to+factory+settings PDF link annotation
    • http://wavakidagipav.iblogger.org/cannibal_holocaust_300mb_movie.pdfIn PDF document text
    • https://vidatizotasajad.weebly.com/uploads/1/3/4/0/134017381/4394536.pdfIn PDF document text
    • https://xaripapaxogazix.weebly.com/uploads/1/3/1/4/131437161/bedusobemumejufebu.pdfIn PDF document text
    • https://ragulifogikub.weebly.com/uploads/1/3/3/9/133986704/364041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_6025c2e8f2d54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392864/normal_5fe04538d0d91.pdfIn PDF document text
    • https://vejupurujiku.weebly.com/uploads/1/3/1/6/131606174/6187346.pdfIn PDF document text
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/608b264.pdfIn PDF document text
    • http://jumufedug.22web.org/67246686272.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/retisovojor/jopekagemipaz.pdfIn PDF document text
    • http://gogamezotuzapop.epizy.com/vitikavimukipitujubej.pdfIn PDF document text
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_36e0e439daa646dcba5256d74db78618.pdf?index=trueIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_bdd93f65823f46ba9cc44583436b1f26.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_4d6fe1a508f145f6b379917cf9c89e11.pdf?index=trueIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_5687f425df8641fc874021349141f9ec.pdf?index=trueIn PDF document text
    • http://nemunuj.rf.gd/facebook_page_cover_size_2019_template.pdfIn PDF document text
    • https://c96d0889-97fb-4213-90a4-a08ae01970e6.filesusr.com/ugd/ed32f2_b8bf1b65d1464483a4c77c2fe38be09b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejideba/manual_template_indesign_free.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/what_makes_a_telescope_powerful.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/binomische_formeln_rechner_rckwrts.pdfIn PDF document text
    • http://josetevuj.epizy.com/solving_inequalities_and_compound_inequalities_worksheet.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_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 5504 bytes
SHA-256: a664a9a633fbf6485b1cbe368de29433940fd5e1079a620ddd6a4aa826300a75
font_01_sfnt_off00010042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 11120 bytes
SHA-256: f34577626b81fa2fc9013332ccaa29c0ea1fa79dfc5bce0bf2165bc9b830359b