Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7b768fe66ab532…

MALICIOUS

PDF

76.2 KB Created: 2021-03-28 08:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d348db22c7dd74fd4eb029d12f4e4ee SHA-1: 8eb5985ca3985e4a2ce6fc0c909be55b15741969 SHA-256: bd7b768fe66ab53259fab73c388dbe547b5251d6deb4dc9cd4b501a1cbefbadf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting it's part of a link farm designed to drive traffic or distribute malware. The primary external URL points to a site that appears to be related to search engine optimization and potentially malicious content distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=angielski+gramatyka+%25C4%2587wiczenia+pdf+chomikuj
    • https://dowikonusinewe.weebly.com/uploads/1/3/4/3/134374018/nobediwip-tidirub-fuvovoridare.pdf
    • http://snt-br.ru/94594856770ii4wb.pdf
    • https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/7957791.pdf
    • https://serofewaz.weebly.com/uploads/1/3/1/3/131379274/2c20f7f73d.pdf
    • http://sexedate69.site/xfinity_prepaid_refillc8sts.pdf
    • http://testrun.ru/58543014487eugtf.pdf
    • http://mmmmmme.space/welcome_banner_template_powerpointg4o9t.pdf
    • https://fobedixosofano.weebly.com/uploads/1/3/4/3/134377241/962504.pdf
    • http://nesobaka9.xyz/6827326641612q2u.pdf
    • http://domen3.club/dexolozeminetosaxe137k0.pdf
    • http://copyright-notice-ig.com/43333548918ytsyn.pdf
    • http://6gusevshop.space/jexotabunizofusuta987aa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f4fec357-0975-4c95-90d1-fe7165be1869/85270595632.pdf
    • https://s3.amazonaws.com/genukopapovixo/joneranotimezarumo.pdf
    • https://uploads.strikinglycdn.com/files/14eec4a1-4237-4fa9-b2bd-982b5112f3c1/47512293886.pdf
    • https://uploads.strikinglycdn.com/files/e043cd07-80d4-475c-a61e-33972715f2aa/jududon.pdf
    • https://s3.amazonaws.com/ninazarila/arqueologia_do_saber_foucault.pdf
    • https://uploads.strikinglycdn.com/files/5d9335b8-98a8-4aa1-9d9f-c326e04cd062/2018_toyota_camry_for_sale_dallas_tx.pdf
    • https://uploads.strikinglycdn.com/files/10babbd4-4d62-4fa7-a173-c26f4e36fec6/download_film_fifty_shades_of_grey_freed_sub_indo.pdf
    • https://uploads.strikinglycdn.com/files/1a27072f-865a-4222-8cd4-74ab27ef539b/47848363841.pdf
    • https://uploads.strikinglycdn.com/files/d961ce28-5d85-4d93-a172-da6d03cce575/mofudesimoxivesanuxesigor.pdf
    • https://s3.amazonaws.com/nemafu/14977656899.pdf
    • https://uploads.strikinglycdn.com/files/06f8efcd-de76-482a-bcb1-a30297df4598/wurifokipejoxogobodezawa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e5.bin
dd10d25bedb6ef95bcfda81e665f660fdfcdae95ea46df006f32591dcdde1e59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E5 6080 bytes
font_01_sfnt_off0000fa54.bin
33af93d2633d80a42ab45ab4563ab0252be4b891c0fee12fb035260792cfb5b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 12132 bytes

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