Malicious PDF — malware analysis report

Static analysis result for SHA-256 58800a710b5089f2…

MALICIOUS

PDF

76.4 KB Created: 2021-02-22 19:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 18befe849b70ffc21d2142ce9d247ab6 SHA-1: 2bccaf03d05bb2aa05de726b4bb2767d2ad5758d SHA-256: 58800a710b5089f2e4fc8888a3b9f1248a2baf4d32dc71600f0d28dbe60eaac7
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. The document contains a large number of external links, many pointing to other PDF files, suggesting it is part of a link farm designed to drive traffic or distribute further malicious content. The primary external URL observed is jottigo.ru, which is likely a malicious domain.

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://jottigo.ru/strik?utm_term=what+is+symbolism+figurative+language PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369763/normal_601951b51a22a.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/076d6f1e56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459641/normal_5ff2ba2a9f63d.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/350db638d3.pdfIn PDF document text
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/3934584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_601b3caac10ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384642/normal_5fc830a5e754b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414687/normal_5fca64db085b5.pdfIn PDF document text
    • https://ribimefisele.weebly.com/uploads/1/3/4/5/134516567/84671f9b6fe.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/memexelu/drum_beats_music_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/48016392527.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/lentiform_nuclei_and_thalamus.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/71119418207.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/xugowakuvogikadupiju.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/25507269778.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_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 5496 bytes
SHA-256: f29aa85e5bd170b7c2f00d4c6fff8c6397c2afd208d7a49a0b7337463113d8af
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 10848 bytes
SHA-256: da0b32937c8f301d9a345320ec8bb8fb047a640116937987400f94cbaa0fadd2

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