Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4643a9c680c4830…

MALICIOUS

PDF

84.8 KB Created: 2021-04-03 20:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2386117b19986ce9ac1d79124845b9c6 SHA-1: a0be132a4ecaaa44fa7862fc7a2f456859f1f726 SHA-256: d4643a9c680c4830c837ec469210ab047ab5aec1b33cbbe9708ef2078a7948ab
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a security-bypass 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 0.9995

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://fokemale.ru/wix?keyword=mixcraft+8+registration+code+free+2019 PDF link annotation
    • https://bilugejedegigel.weebly.com/uploads/1/3/4/0/134017605/f9013618e.pdfIn PDF document text
    • http://hugertely.xyz/vitubejevapemusa37bc8.pdfIn PDF document text
    • https://zivazumuwekaf.weebly.com/uploads/1/3/2/6/132695746/6477059.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/28192497931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416653/normal_605946e60fdc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496585/normal_602ecd1cde735.pdfIn PDF document text
    • http://usacreditreport.info/ninesogovu5xgdk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_60622906a14cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406782/normal_600f0d1470fb4.pdfIn PDF document text
    • https://gadipofonikiw.weebly.com/uploads/1/3/4/3/134390141/wuxixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499002/normal_60356fff65597.pdfIn PDF document text
    • http://katipef.medianewsonline.com/rezosuriritisovike.pdfIn PDF document text
    • http://axacheat4.xyz/webarchive_tohtc3v.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/sufimumelipaft0bp.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/was_the_movie_shining_through_based_on_a_true_story.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nidalufexif.epizy.com/79577371722.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_841e8f1298bf4ec0a01a535f9b6a4a56.pdf?index=trueIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_dd3441f3b0d44ceda26f3df3ac7fdc09.pdf?index=trueIn PDF document text
    • https://f766a7e9-a0d0-4e3a-bf7c-946d2e8c2ff4.filesusr.com/ugd/bddb96_bdfb86b3db85465291ad33ccb97bc231.pdf?index=trueIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_baa6c66522eb41ff808cb52b2638bbc4.pdf?index=trueIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_a4bb8dbeb3374a91893079d5c3f47e31.pdf?index=trueIn PDF document text
    • http://vufavaxotajoba.epizy.com/95141426330.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 5692 bytes
SHA-256: efd82e20f1277e8d4e5320e6f51c08f071c13a0dda8e4984406b82c7b31f60fa
font_01_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 11664 bytes
SHA-256: 25af264e645e346959d2911f7dc7345e57744459ef58259fd7c9bda1ad23f72d
font_02_sfnt_off000135fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FD 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f