Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c1b6393131251d…

MALICIOUS

PDF

106.7 KB Created: 2021-01-09 05:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 707ed9a6e359f381e3c9384c7d175a9a SHA-1: 3a60a7c957745d7e086db35d66c2df0c8aec17e4 SHA-256: a4c1b6393131251de71262db8aa8e2457ea006fee132289ced607b19f6fd2803
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which point to SEO redirectors designed to phish users for information or lead them to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary malicious URL identified is 'https://traffset.ru/123?utm_term=dnd+5e+boat+speed', which appears to be part of a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffset.ru/123?utm_term=dnd+5e+boat+speed PDF link annotation
    • https://vivazezege.weebly.com/uploads/1/3/4/0/134041722/mebewide.pdfIn PDF document text
    • https://jezugazaditok.weebly.com/uploads/1/3/4/6/134601365/wurixutegita.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/xixonu/chestnut_flour_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/5718827187.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/sample_leaving_against_medical_advice_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d87182-ee16-4626-a2d5-38d1cf1ce66c/new_england_outerwear.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/fulazufez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a2c109d-a6ec-4c08-a36c-630d3acacda2/the_digsite_osrs_quick_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/debb8837-b854-425b-88cd-360bf2156a0b/toduwerez.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/zadivapenudagejubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe97c1bd-5ab2-4b88-9c78-c6dfca63bd21/gakoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bc54bf1-5b7f-41da-83ea-28ca011a3f36/kapijewamarika.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16797 5088 bytes
SHA-256: 90dffaeda33e4ae5c70d6fde8c39cc6dc734ac33da0894e3a02ac4a4199c43f7
font_01_sfnt_off000178fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178FB 10688 bytes
SHA-256: 0d4c9ae930aba971c1785d0a5d98653bb8803d315a996cfd0071f060009227be

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