Malicious PDF — malware analysis report

Static analysis result for SHA-256 08dc0f96db466c70…

MALICIOUS

PDF

63.9 KB Created: 2021-02-16 03:07:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 6f0a490fc994d0b9fb16779d0b601ecb SHA-1: 979575a41a12bad74eb0a1574ec6542723d7b83c SHA-256: 08dc0f96db466c70c6a519e86b26bb88e08905561c5b1b414eff07dd427b88d4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files with numeric slugs, indicative of a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jacksth.ru/wix?keyword=manual+de+usuario+software PDF link annotation
    • https://totakolexab.weebly.com/uploads/1/3/5/3/135391630/kunofilikejajom.pdfIn PDF document text
    • https://dadurafiwazozu.weebly.com/uploads/1/3/4/7/134768329/bomowalage.pdfIn PDF document text
    • https://zovamegazojuji.weebly.com/uploads/1/3/4/8/134849063/xajuxilinon.pdfIn PDF document text
    • https://vukajikabazaxeg.weebly.com/uploads/1/3/4/7/134711597/sarixofafotavi_povitorotatedu.pdfIn PDF document text
    • https://wuvumivew.weebly.com/uploads/1/3/1/4/131410662/tebokuvewobiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_6012d08c80b35.pdfIn PDF document text
    • http://mudelukise.iblogger.org/chiasmata_formed_by_crossing_over.pdfIn PDF document text
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/boguwozovep-voveru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fapaga/18659814119.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/88720333846.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/fupuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/let_her_go_sheet_music_piano_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/30399008446.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_off0000c271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC271 4996 bytes
SHA-256: 28e719bd5296e2abd51aac6d678e83a9255773f37d5b0d18793267d863373a46
font_01_sfnt_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 9208 bytes
SHA-256: 08ed810ce332d46ab292a74d9d1f40a3847bed6f22a7095f5bdf0a1e558da9ca

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