Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a632d03e3dd1129…

MALICIOUS

PDF

86.3 KB Created: 2021-05-26 20:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5206fb1295e203c4586585f4a6e7579f SHA-1: b88ac19dd247915f97ac895a5e679ce5017fb303 SHA-256: 3a632d03e3dd1129f0ed17fce518a7a1d0be1b967bfec4723a272d3e1ad2f180
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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 0.9994

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://ponafet.ru/strik?utm_term=how+to+be+a+forensic+pathologist+uk PDF link annotation
    • https://doretufokisa.weebly.com/uploads/1/3/1/4/131438244/2ca7eec8c8a01.pdfIn PDF document text
    • https://kopikemuv.weebly.com/uploads/1/3/0/7/130740389/savesakosodogij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501193/normal_601983205bd87.pdfIn PDF document text
    • https://vejuvofarazaxar.weebly.com/uploads/1/3/4/3/134355137/gorasekobiminut-fopusanupafi-dalujow.pdfIn PDF document text
    • https://xakezoram.weebly.com/uploads/1/3/4/4/134497816/8ee408687c5550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455881/normal_6011e2cb726d4.pdfIn PDF document text
    • https://ropujumidud.weebly.com/uploads/1/3/1/4/131406541/mujolatiziw_misiwazobelet_bofidomozazoxev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383579/normal_60315ae4dc8c8.pdfIn PDF document text
    • https://vifoxofanope.weebly.com/uploads/1/3/4/6/134670603/ganutuzasofupuzexen.pdfIn PDF document text
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/kaniwoji.pdfIn PDF document text
    • https://sileperu.weebly.com/uploads/1/3/1/4/131406390/mitobelakidaxibifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470967/normal_604397fbc4678.pdfIn PDF document text
    • https://javogukurajukip.weebly.com/uploads/1/3/4/2/134235542/wiwuzibemobal.pdfIn PDF document text
    • https://xezatitewifesel.weebly.com/uploads/1/3/4/3/134393938/4b996.pdfIn PDF document text
    • https://safizasuto.weebly.com/uploads/1/3/4/5/134595990/9283883.pdfIn PDF document text
    • https://xavebebojemap.weebly.com/uploads/1/3/4/8/134848852/pobebiduvorazuro.pdfIn PDF document text
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/285932.pdfIn PDF document text
    • https://rijifupipi.weebly.com/uploads/1/3/1/4/131453414/7741666.pdfIn PDF document text
    • https://rujunile.weebly.com/uploads/1/3/2/7/132710621/2736877.pdfIn PDF document text
    • https://vafoxerosasajox.weebly.com/uploads/1/3/5/3/135398531/rapodepuruxugutub.pdfIn PDF document text
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/maximuvo-kuner.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/4258386.pdfIn PDF document text
    • https://mumevifovamix.weebly.com/uploads/1/3/4/4/134486033/zapipolefisigupilof.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_off000113c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 5536 bytes
SHA-256: 06fae3a04ed4406a69f6b7347756b3e78c0952dc3dd484ceb92d8679ec4ec6ae
font_01_sfnt_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 11072 bytes
SHA-256: 2b391769858ba43e06826c5ef7d09abcd37d2929b4924e975e34fdb8ddde4824

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