Malicious PDF — malware analysis report

Static analysis result for SHA-256 3396b4fa61237ed6…

MALICIOUS

PDF

67.5 KB Created: 2021-02-25 18:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 06d3ce18a6b77d43034f2c284792b826 SHA-1: 62f0ace1b5126436a424358d7eff202182264c44 SHA-256: 3396b4fa61237ed6668d0946708a04107d0eec616962fcf38496ba97997fb1c9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=radio+merit+badge+pamphlet+download PDF link annotation
    • http://useplafond.xyz/nozatibifigowividoxop14sg3.pdfIn PDF document text
    • https://ribupawotomimam.weebly.com/uploads/1/3/4/6/134694318/8f4253f38.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/okRdieN/23602641822.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/OhgMGhh/delicious_website_for_teachers.pdfIn PDF document text
    • https://cdn.sqhk.co/xafemepino/TNMhdii/best_compact_drum_kit_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/jnV0Ujc/sisezegafapufosave.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/8kdhf7M/kedos.pdfIn PDF document text
    • https://xapefawisago.weebly.com/uploads/1/3/4/7/134771693/xavasozipevepejosapu.pdfIn PDF document text
    • http://abreudesigns.com/candy_land_rulesbswwo.pdfIn PDF document text
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/80100c0cd3.pdfIn PDF document text
    • https://cdn.sqhk.co/tipekafomube/fjigdIX/suwajeba.pdfIn PDF document text
    • https://xizexinapak.weebly.com/uploads/1/3/4/3/134359948/801f14898300.pdfIn PDF document text
    • https://cdn.sqhk.co/lukisebeka/gZmp2RJ/hilly_io_mod_apk.pdfIn PDF document text
    • https://nanezafukixepa.weebly.com/uploads/1/3/4/5/134526153/144532.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/6125248.pdfIn PDF document text
    • http://repetitor-ru.ru/badenweiler_marsch_notenamsch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE5 5436 bytes
SHA-256: 8c3e5cd1ab27792727c57ff249aca44dc19d6bd7fe66a407a224dbd361d81a85
font_01_sfnt_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 10056 bytes
SHA-256: aa548528f71b3b9c41e9970856472d2355ad0499175a53399d1c1936ce8cf32b

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