Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d150442248282c…

MALICIOUS

PDF

102.6 KB Created: 2021-03-14 21:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4406a71476ec39da81931148727e4ba SHA-1: 25f45844bdd7313773d55ebc1e4406a0f9597d79 SHA-256: f1d150442248282c8fb1ae2a9e6a2756ceebcd82871ed841703c1219db37e05a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs, such as https://mezovuduw.ru/wix?keyword=mysqldump+incremental+backup+script, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=mysqldump+incremental+backup+script
    • http://livemavuxedu.getenjoyment.net/24911474751.pdf
    • http://gawudubigojan.getenjoyment.net/hssc_declaration_form_annexure_e1.pdf
    • http://galosidijixiwu.mypressonline.com/19378343654.pdf
    • http://rezanufeku.mygamesonline.org/download_novel_bossypants.pdf
    • https://mexepefavofuj.weebly.com/uploads/1/3/4/6/134659137/subidofopaluz.pdf
    • http://pozufopajosel.mypressonline.com/2226658816.pdf
    • https://fojozotewimoko.weebly.com/uploads/1/3/5/3/135324817/zamilizefetetunikab.pdf
    • http://tozofuji.scienceontheweb.net/27761364342.pdf
    • https://rawabibag.weebly.com/uploads/1/3/4/8/134870232/vonuvebosarubil.pdf
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/lavev-jepilamuzu-jutevuwitojize.pdf
    • https://letavozogat.weebly.com/uploads/1/3/5/9/135978758/wezelajijifofigiki.pdf
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/0d5c071.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gozidonozali.myartsonline.com/craftsman_garage_door_decorative_hardware.pdf
    • http://dowuvoduwitovos.atwebpages.com/wixipefam.pdf
    • https://8c8a1d26-85df-410e-9d08-38b72659c452.filesusr.com/ugd/63f22d_f48940c789c74569a0e8e9a72ff27109.pdf?index=true
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_a7afd8cf7034430ba44feda553adbd29.pdf?index=true
    • https://s3.amazonaws.com/jikopot/arashiyama_bamboo_forest_japan_guide.pdf
    • https://s3.amazonaws.com/tujeviwakirawu/five_bases_of_power.pdf
    • https://s3.amazonaws.com/guvovigo/79564040557.pdf
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_6b3544c4de16414fb37ee7f29c96740f.pdf?index=true
    • https://s3.amazonaws.com/fedojigudaj/spanish_reading_comprehension_worksheets.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015125.bin
71ed3175b126d27c1cb6cb9ef6274adecf204b68d5ebe38215d60357b4ade730		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15125 5656 bytes
font_01_sfnt_off00016456.bin
4c7f52746248d490bf0ce15057c6acd776773c496ce116121bdc0099e868f535		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16456 11872 bytes

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