Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a5bf2cba60d94d…

MALICIOUS

PDF

73.8 KB Created: 2021-03-14 06:36:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ff84e980d6ffb4f835a5596f5e74fd42 SHA-1: 4ec70eeeb2ef355189788efb4fb0ceb998eb9757 SHA-256: b0a5bf2cba60d94d90fb07033a65188fa327b1e5b4f8b1051faaf8e5a547f2ed
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1190 Exploit Public-Facing Application

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to obscure the true destination. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document content likely attempts to trick users into believing there are changes to payment or banking instructions, a common tactic in business email compromise attacks. The embedded URL 'https://kuzutuzo.ru/123?utm_term=backdoor+roth+vanguard+guide' is a primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://kuzutuzo.ru/123?utm_term=backdoor+roth+vanguard+guide PDF link annotation
    • http://zuduwamani.mypressonline.com/vezoxo.pdfIn PDF document text
    • http://bimovixexena.scienceontheweb.net/blackjack_cheat_sheet.pdfIn PDF document text
    • https://jevejokanidepit.weebly.com/uploads/1/3/0/9/130969277/9728473.pdfIn PDF document text
    • https://wipugetawunuw.weebly.com/uploads/1/3/5/3/135302850/f7523ff.pdfIn PDF document text
    • https://lugifepitel.weebly.com/uploads/1/3/2/7/132710690/4099641.pdfIn PDF document text
    • https://pejupatuwotim.weebly.com/uploads/1/3/2/8/132814375/xotolasol.pdfIn PDF document text
    • https://kimilirakafame.weebly.com/uploads/1/3/4/6/134659192/f759f84ad59f.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/tokemox.pdfIn PDF document text
    • https://xazebuwojij.weebly.com/uploads/1/3/4/4/134467588/wapifuj-vilusi-pabizoxenu-wutegux.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/wordly_wise_book_6_lesson_12.pdfIn PDF document text
    • http://viwesisikumebi.getenjoyment.net/baptist_hymn_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xixisetakaku.epizy.com/ammonium_sulfate_precipitation_table.pdfIn PDF document text
    • http://jiresigotapikeb.rf.gd/inertness_of_nitrogen_chemguide.pdfIn PDF document text
    • http://vonanovab.epizy.com/dovetixanazixapojela.pdfIn PDF document text
    • http://wedizakur.epizy.com/essay_planning_template.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/22._how_many_chickens_would_it_take_to_kill_an_elephant.pdfIn PDF document text
    • http://rorokepu.atwebpages.com/jaketijavamixaniju.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_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 5164 bytes
SHA-256: b1f8e5c48e4e7745fd6f34ac5b0b830006db038cd00ed5039d81c85216019c05
font_01_sfnt_off0000f50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 11016 bytes
SHA-256: 382f35d332c347bc5536b3e90064f247730ecc801af8084b83223124623e0463

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