Malicious PDF — malware analysis report

Static analysis result for SHA-256 7401244bdd902baf…

MALICIOUS

PDF

82.3 KB Created: 2021-04-04 01:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c057ccf7c4e1bb996b7c56f639ee465e SHA-1: c463289295912958d992140d41413324c6a7d080 SHA-256: 7401244bdd902bafb18624aeb65e5f5252789b4ce9135ec23404f51532583ae8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicative of a link farm or phishing campaign. The presence of a "Jio calling video" lure in the document body, combined with heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, strongly suggests a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://botokaw.ru/123?utm_term=jio+calling+video PDF link annotation
    • http://teachost.com/seperiporixelosexiaipyb.pdfIn PDF document text
    • http://my-favshopg.online/impossible_quiz_24_answermw0e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_604971c9c2195.pdfIn PDF document text
    • http://study-english-04.space/jesulatonisevou3xxj.pdfIn PDF document text
    • https://sebumeganajili.weebly.com/uploads/1/3/0/8/130874272/vujarexotixogog.pdfIn PDF document text
    • http://comp-arenda.site/39354272111vsv56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489615/normal_5fcecc662d693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471475/normal_606772f118385.pdfIn PDF document text
    • https://wuwemupijebuvat.weebly.com/uploads/1/3/4/0/134012408/sopawepofav.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/35783040853esasm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450513/normal_5fddfd3c867bc.pdfIn PDF document text
    • https://gefozusep.weebly.com/uploads/1/3/5/3/135346228/21558d32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445890/normal_600046f69ac1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_fce3993fccbe4009877cef0c18bf5a5b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/char_broil_performance_tru_infrared_500_review.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_853a1d2c834d4c558d3a039111046087.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefagolom/roxazavugafaluvenadis.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_7f5964d128f346e68fddb880205c8342.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_0e1498be33bd425a80d213fff4dcc620.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizaxo/81022568744.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/58079901108.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_25aa026dd9f142d3bc5080c3e95c7364.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/66701086752.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_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 4884 bytes
SHA-256: 08046ebc5332737df69e989acc06eb119c3f820dbe1abd1f57fa4735d0aaa0c3
font_01_sfnt_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 12604 bytes
SHA-256: 690098c613878537d1c81bed0efb4b0eae9d9fb8a611e016737cdbc82926a970