Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f658e5a8606d20…

MALICIOUS

PDF

83.6 KB Created: 2021-03-23 20:29:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c0549b31b278478d830d9d2ebf241c9f SHA-1: 0c500a9c69a77bbb937e9376e8bc5ad47bb7d55b SHA-256: b1f658e5a8606d2064c5ee20a19a527c8c35d7a79112d2f60c62bfe99f9a30fc
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or scam attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the primary URL found is likely part of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9601

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.
  • 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
  • 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://xezojetit.ru/aws?utm_term=bible+quiz+questions+for+youth PDF link annotation
    • https://veborejekeraleb.weebly.com/uploads/1/3/4/4/134480613/4461096.pdfIn PDF document text
    • https://xonutupusuvulin.weebly.com/uploads/1/3/1/8/131871786/patewasebitak-rexoxepepukobi-tisaroma-wegikupunawol.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/zegunewamis.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/reading_comprehension_test_grade_8.pdfIn PDF document text
    • http://de-bewertung-889562.icu/96793960273l8h3x.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/wheat_belly_recipes.pdfIn PDF document text
    • http://idealica-italiaoficial.site/vietnam_us_army_uniforms_for_salerjn5y.pdfIn PDF document text
    • http://presentinsta.site/82596304166ortlj.pdfIn PDF document text
    • https://saworajopasu.weebly.com/uploads/1/3/0/7/130775294/9590405.pdfIn PDF document text
    • https://saxipapes.weebly.com/uploads/1/3/0/7/130738636/1091287.pdfIn PDF document text
    • http://manthoughtswebsite.website/6450200692m1wdf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_68335270c1094dc0afc2a62641de67cb.pdf?index=trueIn PDF document text
    • https://2b075577-062e-477b-ba44-a680027dca12.filesusr.com/ugd/ee943f_756460bac5f34c109d4cab504a20aa7d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4ebd73-f185-4366-873e-ed3c070f0c09/how_to_prevent_cpu_thermal_throttling.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_063360c5fa404ccf9e29502efffdecfe.pdf?index=trueIn PDF document text
    • http://bemawom.rf.gd/zusowexawafokumap.pdfIn PDF document text
    • http://fozilixugijuva.epizy.com/uji_non_parametrik_adalah.pdfIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_e921944079cc42368228112e133ae27f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76cdc232-06b1-4142-af65-986656cea3c6/jitotemo.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13010 5112 bytes
SHA-256: 45a2043eaa0bd621ffc442eda97edb89a82f4a954cc6ff5d49d99a878de03ce1

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