Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c540a2184c105d…

MALICIOUS

PDF

67.2 KB Created: 2021-03-15 03:49:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0134cc159bb21d23a8a9788088e601f1 SHA-1: 11b515e1e16298cd9d95734c88e4b346a9dcc108 SHA-256: d9c540a2184c105de48226cc55d66d207ceed46be1847523ee8932f52981a191
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-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://fokemale.ru/wix?keyword=definition+simplest+form PDF link annotation
    • https://relazubaw.weebly.com/uploads/1/3/5/3/135315829/zekefivum.pdfIn PDF document text
    • https://cdn.sqhk.co/zekuxemelop/jhfiaT0/97113206082.pdfIn PDF document text
    • https://cdn.sqhk.co/tosemixuru/vicgijh/drag_box_scraper_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413005/normal_600575a6650e1.pdfIn PDF document text
    • http://fresh-ita.space/25595996210sy6pg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378606/normal_602c3a80acb08.pdfIn PDF document text
    • http://easylearning.space/zepobomasezufinepoxoebo3j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471723/normal_601b5c75a09a9.pdfIn PDF document text
    • http://vorecan.space/what_are_the_seven_elements_of_designwcp23.pdfIn PDF document text
    • https://sawolopu.weebly.com/uploads/1/3/6/0/136049845/68bbe131d.pdfIn PDF document text
    • https://nelajelax.weebly.com/uploads/1/3/2/7/132712676/613913.pdfIn PDF document text
    • http://socialwave.me/breckwell_pellet_stove_service_near_meyqnvm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_5fd0ad79002ba.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/f1e383b7-e86f-4dd2-ac76-ff31bbc7f282/wijakolitikux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca78718-4dad-4ef3-a93c-5968a3d377ac/34485807652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/535152ed-6c1c-4d2e-94a0-96beada6e13e/lojepilujolipefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f72f02c-2f2b-430c-ba64-e8d935c9b7df/6304358400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eda7ebb9-6723-44aa-a3e4-b4f6f093974b/nc_drivers_license_renewal_real_id.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_off0000cb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB51 4836 bytes
SHA-256: 3af89e3715fe5b6c72e8693b7ce9e8b1d36339a190b994b10b50dc2f7bf5b883
font_01_sfnt_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 10628 bytes
SHA-256: d38e31ec604e6e74378980a0bf4ef89710b980b893d4671f3a7b32126891de09

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