Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d5d31ad044c2f4…

MALICIOUS

PDF

75.3 KB Created: 2021-03-20 05:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dde9504b2b31f3cc105a12f73db23519 SHA-1: a9a07fe41ae74ee8eef5d9a2eb450780c6334350 SHA-256: 09d5d31ad044c2f41c4d35c94491ec8bc59cd99adb102242213f6480b6214b46
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to suspicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=microscope+mania+worksheet+answers
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/pikufeluwuzokolalare.pdf
    • https://cdn.sqhk.co/fexiseme/igghVhj/jadamosedob.pdf
    • http://nunopasatipimav.medianewsonline.com/briar_rabbit_story.pdf
    • http://wujasonuvilo.mywebcommunity.org/budidunumibofe.pdf
    • https://cdn.sqhk.co/dasofuduveje/idggX3s/2049558463.pdf
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/8701654.pdf
    • https://cdn.sqhk.co/posogamumut/gUhijVg/comprehension_worksheets_grade_5_printable.pdf
    • http://gedirobidepud.scienceontheweb.net/lumolijatobokekav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_5fce2d84ff6d47a4993b51ba8ae44c31.pdf?index=true
    • https://eae964be-cf9f-49a8-9b2f-00020d526acb.filesusr.com/ugd/e932cf_51df75d3b92b4be59e8919862347e37b.pdf?index=true
    • https://s3.amazonaws.com/xapijifas/chavanprash_song_bhavesh_joshi.pdf
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_60a5bf3f46c6400fbf40a80e40871752.pdf?index=true
    • https://s3.amazonaws.com/xovajukoxin/21183124744.pdf
    • https://38c64f87-0506-4925-a3a1-425743e24937.filesusr.com/ugd/386d45_9334dd047185437d9d42de276b0f1fbb.pdf?index=true
    • http://kofaxafogi.myartsonline.com/8140821117.pdf
    • https://s3.amazonaws.com/mogedozara/12447554579.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbab.bin
1eb99b7b42809769be3507daadfbc698e8ace58f2e6df8e76714cad648ad61dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 5088 bytes
font_01_sfnt_off0000ecd3.bin
8c0cd0b27df7003dd80576a7f79d1734e66018fd4c47025e874f908add5cca1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 10952 bytes
font_02_sfnt_off0001121f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1121F 4324 bytes

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