Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d7dc3ed9b10243…

MALICIOUS

PDF

83.1 KB Created: 2021-05-12 02:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 82325b5846aef4794fd5de86bc1c50ab SHA-1: accf6b1728b0c8c0490a66f45717c3300117ba14 SHA-256: 45d7dc3ed9b10243936989eb7f32dd4c9b430c84eb128041db575e8e7b6e0e59
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The document body, though heavily garbled, suggests a lure related to 'romance novel translation'. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://maypoin.ru/strik?utm_term=livros+de+romance+tradu%25C3%25A7%25C3%25A3o+em+ingles PDF link annotation
    • http://pedalini.club/tunumiruxajalozerifasaszipsq.pdfIn PDF document text
    • https://cdn.sqhk.co/bowazeduz/je21XpC/xoom_money_transfer_login.pdfIn PDF document text
    • http://com-signto5.xyz/waring_pro_waffle_maker_wmk300_partsgki2k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418185/normal_604124fedab6b.pdfIn PDF document text
    • http://centerverifybadge.com/gigajokow315sz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379841/normal_5ff9fba49b930.pdfIn PDF document text
    • http://kanshoper.site/2981801929075gbg.pdfIn PDF document text
    • http://vknart.xyz/bovetikexukes5y6v.pdfIn PDF document text
    • http://zdorovienashevse.xyz/65806542770r6627.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418391/normal_5fceea8822231.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369775/normal_60085acf58f81.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/Fhc5mib/formula_car_racing_2019_hack_version.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/hi3sAhe/code_vein_bayonet_guide.pdfIn PDF document text
    • http://idealslimitaly.site/bomezefexokul5mn61.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/lhb4jad/gomumafo.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5fd63602617b3.pdfIn PDF document text
    • http://sakhavto.ru/2_themes_in_anthem_for_doomed_youtha8gu2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_776217584d7544f9af40ed2800d89fea.pdf?index=trueIn PDF document text
    • https://f9a132f0-acc9-4761-b7d8-38025aedd849.filesusr.com/ugd/5c71d6_efed6b033c554537b9dafb7e5e86d5b7.pdf?index=trueIn PDF document text
    • https://6e337ffa-6c75-4e98-916f-0cab85e7e3f5.filesusr.com/ugd/a22560_3186e1e4db654be5b50bf3f7d655bbd5.pdf?index=trueIn PDF document text
    • https://fc59733d-949e-4df9-817b-fea2515c5cc7.filesusr.com/ugd/689329_20a6a6cba4164e0ba2e93ecbc6bbf2bc.pdf?index=trueIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_d9b57b33a00d443488e2a9f448ab8da6.pdf?index=trueIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_0552df2c51de49bfa942bb873853e144.pdf?index=trueIn 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_off000100ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AD 5760 bytes
SHA-256: cf162c304ba446b44940302506e981e4cfbeae4b3f73fd7d1ae86d00989ed7ac
font_01_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 13288 bytes
SHA-256: 7d7356700d435b707ff68341f8382780d10f262cc8a50884e5a0d05c1e21346e

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