Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40237ef26bbb491…

MALICIOUS

PDF

80.8 KB Created: 2021-03-12 20:22:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bfefb244b55128e8e06f808b6b171b2b SHA-1: 7e0e872b29e4fae6cd6fad222243f110008967cf SHA-256: a40237ef26bbb491d2a9652f02a7ef228e05a3dbbfeadabcbf63745611aed188
186 Risk Score

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 0.9992

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://vilenefex.ru/wix?keyword=beatrice+and+benedick+argument PDF link annotation
    • https://cdn.sqhk.co/sorubajuzoxe/gOWYnij/nolemorumepawifirobumatig.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/KjdfOgh/79294330818.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/hdtii2x/85762980972.pdfIn PDF document text
    • https://kotazadan.weebly.com/uploads/1/3/4/3/134349323/3037553.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/LoihhfB/46309124468.pdfIn PDF document text
    • https://nedalejurozawo.weebly.com/uploads/1/3/0/7/130776692/9771520.pdfIn PDF document text
    • https://venatijaw.weebly.com/uploads/1/3/4/6/134680547/2644a4af.pdfIn PDF document text
    • http://zupebupinumupo.iblogger.org/55212254534.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/gNmibed/77419013659.pdfIn PDF document text
    • https://cdn.sqhk.co/bularalunop/g3hkggz/71778659429.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvetuzaxi/jjjjcjh/77476075418.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/ghjjAji/ncert_book_class_9_physics_chapter_1.pdfIn PDF document text
    • https://varudigenaka.weebly.com/uploads/1/3/4/5/134597471/6d4879e2a2.pdfIn PDF document text
    • https://jonolepazom.weebly.com/uploads/1/3/4/5/134520471/zuzujodal.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/eBdijjj/arcade_fire_wake_up_video.pdfIn PDF document text
    • https://cdn.sqhk.co/mekerijiwuv/icgciiZ/88506180751.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/Gibzhf1/fonanupeduroloviwis.pdfIn PDF document text
    • https://cdn.sqhk.co/pewesopefim/slnghVY/business_week_calendar_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://foweroboxufafuv.epizy.com/5227682474.pdfIn PDF document text
    • http://mutidulofof.epizy.com/showbox_android_tablet.pdfIn PDF document text
    • http://webubekesivamuf.epizy.com/53810046416.pdfIn PDF document text
    • http://kugunimekuxaf.epizy.com/56248601048.pdfIn PDF document text
    • http://xeketak.epizy.com/easy_vegan_no_bake_granola_bars.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 5076 bytes
SHA-256: 5d1f7b6679ee5125b0d1be7053b501d8fba1d21823d6b1cf7c6ca3af22f9fcd4
font_01_sfnt_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 9980 bytes
SHA-256: 0dbe9cd55fb41e57773924b52b896992b60608c1fe3ec421eaaa0e754473ef7a
font_02_sfnt_off000127ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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