Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad18112a12560e2d…

MALICIOUS

PDF

67.7 KB Created: 2020-11-21 08:25:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9f1a90dc934b85297f44a10223321849 SHA-1: 7c653cbd9bf6142b8ac1eba68e69a74207e12a31 SHA-256: ad18112a12560e2d537d3cd7d8c33bc2403c0a0d2f1a8aee1b850d842e518e09
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/123?utm_term=lesson+5.1+practice+b+for+use+with+pages+294-301 PDF link annotation
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rugatu-rugot.pdfIn PDF document text
    • https://kuxilididid.weebly.com/uploads/1/3/4/3/134387830/firoxu_sexurev_wegefafivir_xinevikubomuxe.pdfIn PDF document text
    • https://xizirogubo.weebly.com/uploads/1/3/0/7/130776043/6534821.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/8683090.pdfIn PDF document text
    • https://zuvimigiga.weebly.com/uploads/1/3/4/5/134586735/geribiranofefoj_wudufije.pdfIn PDF document text
    • https://kowepesabileb.weebly.com/uploads/1/3/4/6/134635017/marig-gujemijorizepe-molopozena-jizogitapolodur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d95427a-9614-48ab-bc62-2492948c04b9/kosekaserugupebezisikutar.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/xodatawutofekoruvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ced966-aef2-4f74-a356-32c447f1650b/vefobatemixate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff81640-2a74-40d5-aa3d-d6ae52d8460a/nomatukolidinav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d0947d9-aff6-4d89-bd2f-84a63e9e36d8/nidaxasijobokodepagudat.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/64539949716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af53c23e-7215-45e5-8a6d-b3a743edc583/monster_manual_5e.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_off0000c732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC732 6340 bytes
SHA-256: 5023d5f13c03a696da14b896f38f9843e0b1e1c92b555f94c79de21ebe07e1d3
font_01_sfnt_off0000dce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 10840 bytes
SHA-256: b97b69c192d15c686e289917cead5ce12fdecb540fca0884b8f667c50f603adb

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