Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d648a1bdd05db90…

MALICIOUS

PDF

83.3 KB Created: 2021-03-02 06:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c100faf68f15dc99b37e5e8a32db79c9 SHA-1: f4e00735b7cd56cc98857ca9cbaffc3bd732dd02 SHA-256: 4d648a1bdd05db90c29a370bc2f2884f6691e3e610725784c0a1ffd3732c0e8f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://druttle.ru/wix?keyword=moleskin+for+blisters+target PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446026/normal_5fdd086603da4.pdfIn PDF document text
    • https://jekunido.weebly.com/uploads/1/3/4/3/134312583/nifisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_6025fb3db4017.pdfIn PDF document text
    • https://dopovubejaxow.weebly.com/uploads/1/3/4/0/134017692/mipaxofuvazoves-nuteg-pabemuragatak-luruxibul.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/KjaHMhi/cardboard_recycling_omaha.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/linea_del_tiempo_historia_de_mexico_epoca_prehispanica4ict7.pdfIn PDF document text
    • http://milanomodaitaly.site/color_shifters_hot_wheels_carssjtcn.pdfIn PDF document text
    • https://cdn.sqhk.co/kovajivika/8hieVG2/gewolufoduzibaf.pdfIn PDF document text
    • https://rakamirun.weebly.com/uploads/1/3/4/9/134904708/pixanirisobezi_lukap_tulis.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/zQric9V/77830817879.pdfIn PDF document text
    • http://the-job.ru/tifavifeduxifamadazazi41w02.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/geEghje/building_house_models_kit.pdfIn PDF document text
    • https://dapapakutuluj.weebly.com/uploads/1/3/1/3/131384169/gurekesanarobij_danedojer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_5fd6c94d7dce7.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_off00010955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10955 5144 bytes
SHA-256: 7a71abef5562f489a2c94be3a7095a2e394780c9850f1caab90b499905199867
font_01_sfnt_off00011af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF6 11028 bytes
SHA-256: 7d87f15048a3bf96b27ca907b6c38ebccb986bd24065b6c9c03365e103928cce

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