Malicious PDF — malware analysis report

Static analysis result for SHA-256 686cc28dff86a01a…

MALICIOUS

PDF

93.3 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: 7c422c4a2160b45e5a11a14d1959b443 SHA-1: c7891da1165069bdd6b66e982aed14431f18a2a9 SHA-256: 686cc28dff86a01a7bef133a3c009ea5c3e9322b53966bc48a58b1d0db1ecda7
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 multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, appears to be JavaScript, likely used to redirect users to malicious sites.

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://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://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_off00013010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13010 5112 bytes
SHA-256: 45a2043eaa0bd621ffc442eda97edb89a82f4a954cc6ff5d49d99a878de03ce1
font_01_sfnt_off00014187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14187 11296 bytes
SHA-256: 5ce329b65ff4c02de0131e21f24ed6a121f0e4053254a529da14bd00ace4dadd

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