Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d0cf7fa185fcad…

MALICIOUS

PDF

87.4 KB Created: 2021-02-20 20:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 34e2d50b1edabe41f24d66a91ac9fc95 SHA-1: 9cdb43f6613ea3281334a245755b7e4917928d35 SHA-256: 66d0cf7fa185fcad690cf702b7d0aed5c1bc301f1127db950a2e41f552545b13
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://jacksth.ru/strik?utm_term=604+meaning+bible PDF link annotation
    • http://vinuporabomod.iblogger.org/simitetupikononepoj.pdfIn PDF document text
    • http://scandisvet.ru/suwekuwutd40wm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482415/normal_5fcaf2b5f0d56.pdfIn PDF document text
    • http://se-mrush.com/99393525686j1gos.pdfIn PDF document text
    • https://kofekatemate.weebly.com/uploads/1/3/2/8/132815318/3634814.pdfIn PDF document text
    • http://prizinsta24.online/latest_software_for_iphone_6_pluskl5c2.pdfIn PDF document text
    • http://juwapes.22web.org/chappie_movie_parents_guide.pdfIn PDF document text
    • http://naturebiolog.fun/dugenanarxh7ue.pdfIn PDF document text
    • http://trokot-roznica.xyz/dogs_vomiting_bright_yellow_liquidi9q20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xesidif.epizy.com/34054917549.pdfIn PDF document text
    • http://gowegonuma.epizy.com/jokasovadi.pdfIn PDF document text
    • http://zojabavikejowi.rf.gd/67774086224.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 5160 bytes
SHA-256: 87c536bfa665af57f00887794fe5f3dad397bcf69118e87eee89f686d5d1c299
font_01_sfnt_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 14536 bytes
SHA-256: 8873d12ae69a29bf41dd9c663b79e48b0c6d56468bd3dd3ec2d846b4a690e8ae
font_02_sfnt_off00013bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEF 16080 bytes
SHA-256: e3a49a1a357d81fe17c5ec6e51a949503b25dcbbd6744fb1166083774b0552ba

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