Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a827a0cbf4be12c…

MALICIOUS

PDF

81.5 KB Created: 2021-05-30 06:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 439395d0aac0dfeeb37f82ed9f5ff2ae SHA-1: 78cb21077a8de31674351f366c75a8f6ad8861c2 SHA-256: 0a827a0cbf4be12c7954017cee44374a3198a70b902c3b8a95a822e703662aa6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to various domains, including weebly.com and f-static.net, which are likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://jumiwimov.ru/strik?utm_term=how+to+install+fnis+skyrim+se+vortex PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415935/normal_600ea444e9f40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_600e37ac35d02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379029/normal_606be81985f7b.pdfIn PDF document text
    • https://mogisitubetaw.weebly.com/uploads/1/3/4/4/134496388/bitikanojel-gipev-lelitanubudobup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417206/normal_5fe612fe4b33e.pdfIn PDF document text
    • https://durozuxazoxete.weebly.com/uploads/1/3/4/6/134647509/5e3e4c417781cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471985/normal_601771cd1532d.pdfIn PDF document text
    • https://lurekoba.weebly.com/uploads/1/3/4/0/134018443/3006982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470835/normal_605b89f7957e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496810/normal_6024c95d8dcc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_602098b38dd88.pdfIn PDF document text
    • https://xugofuli.weebly.com/uploads/1/3/1/0/131070332/deluzalib_molab_gesutufaj_mupeberumut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387573/normal_5fd8b137df257.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425933/normal_5fdd08e18981a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393026/normal_6049512b38610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_604f36402fa80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_5fd2de7488a19.pdfIn PDF document text
    • https://fotapudugibinok.weebly.com/uploads/1/3/4/8/134899903/9193719.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470836/normal_5fc6dc638f67f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491933/normal_5ff7c859546b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383929/normal_60104b1e010f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500669/normal_602cdf7eb102c.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_off00010101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 5260 bytes
SHA-256: 7d51a15307513f50970e978e7a0c01cd4ebdb2a2728dd093ecda059481942271
font_01_sfnt_off000112ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EA 10952 bytes
SHA-256: 4dae2e84bda7822c545820a22f4b03a16af52ed4ec0d2d82723103e831321982

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