Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e6dcd367723715…

MALICIOUS

PDF

72.8 KB Created: 2021-04-04 01:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 71fc0899dbca9269702d4af7e635d3d0 SHA-1: 42f8f5173ad4721e3324c6885e15176b1cd93898 SHA-256: c1e6dcd3677237155795e5e37f1f66ac132de02eb949cbe18402cec3ce4e0623
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's structure is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://xezojetit.ru/award?keyword=applied+operational+research+with+sas+pdf PDF link annotation
    • https://cdn.sqhk.co/dasisogi/hhVjcG6/49017752536.pdfIn PDF document text
    • http://5gusevshop.space/how_to_wear_earbuds_without_hurting_earsvfaxf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470020/normal_604f19ba0383e.pdfIn PDF document text
    • https://cdn.sqhk.co/mojerakikav/Imjigd2/35136759607.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475217/normal_5ffac1b171511.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421042/normal_5feb7c85177f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_605877000caf4.pdfIn PDF document text
    • http://cesaregaspari.com/kabimexagikb09t.pdfIn PDF document text
    • https://cdn.sqhk.co/liviberox/hcgdNhi/xazizatojida.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456116/normal_5ff857db3018b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450517/normal_605b61888d3a6.pdfIn PDF document text
    • https://cdn.sqhk.co/zifakepavax/RGiq0Nh/tiny_rifles_unblocked.pdfIn PDF document text
    • http://itdiscount.info/87511784346d7j1s.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/bewusukilafafodopin1kbor.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/uhiWtid/28178763970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462096/normal_5fd8a0b7e2dad.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/qjbhdTe/redbubble_drink_more_water.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/wtsjh4n/amazon_prime_video_pinkalicious.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/7b85052a-a424-4bb7-98c9-6e0b0dc0adcf/texas_dps_sex_offenders_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d490964d-2a4c-492a-a806-29e895e9b9d9/tidosedapenugomasim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8423c150-b3e0-4bf1-91e6-cf8b37ed489a/35102434871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bb1d9bf-d22a-4b3e-b959-c3beea8038dc/book_24_hours.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_off0000ddea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 5324 bytes
SHA-256: df13eb9160478027fc747a47b802e15a06c0db623d1b8da6fb90ae78e176ecc2
font_01_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 10860 bytes
SHA-256: 8aa6b8d77392ab6c0182155b1872aec8c0e0d78acc2b998364fc1e217b06b8d9

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