Malicious PDF — malware analysis report

Static analysis result for SHA-256 52186b0f87e064eb…

MALICIOUS

PDF

67.5 KB Created: 2021-06-04 09:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7eb86d73af085905d617bee7763ca02f SHA-1: c183133b627b476a6c35f7730f5cc5923e3070f4 SHA-256: 52186b0f87e064ebc91e4d23dda07d37ed4b07a2fd931f2db1446e68824923c5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The embedded URLs and the heuristic firings indicate a likely attempt to direct users to malicious websites for further exploitation or phishing.

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://drafthe.ru/pbw?utm_term=maruti+800+workshop+manual+pdf+free+download PDF link annotation
    • https://lenusasifelodu.weebly.com/uploads/1/3/4/3/134350773/5135871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384459/normal_60313b488ef06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454803/normal_6038441ac5118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477400/normal_6066db816a6be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403129/normal_5fde643caf15b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446038/normal_601c0424ed101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472475/normal_606a6a88381f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452377/normal_604e1f2337861.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4383467/normal_60b60c7344b8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393041/normal_603eb65154eff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393893/normal_5fe42a5fc83cc.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4367627/normal_60b285a21e59c.pdfIn PDF document text
    • https://datagoso.weebly.com/uploads/1/3/4/7/134718767/7539991.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144519585/15077977094.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/f/how_often_to_wash_a_waterproof_mattress_protector.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/f/2012_yugantham_telugu_movie_online_watch.pdfIn PDF document text
    • http://gaxoxim.pbworks.com/w/file/fetch/144421401/39508121867.pdfIn PDF document text
    • http://zepupifob.pbworks.com/w/file/fetch/144426888/how_to_replace_battery_in_smael_watch.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144592332/29950197752.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/w/file/fetch/144512499/9820269585.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_off0000cb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9F 5776 bytes
SHA-256: 3c0589bc3a4a8b39cdaec858d6a713251e5e18f6a8e46c645b53bafded711300
font_01_sfnt_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 9668 bytes
SHA-256: 9dc799334f2893d27155e4650e7e54df4838459c80939c27ad4a5ad0cf1c199b

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