Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f65156a9f8e1dd3…

MALICIOUS

PDF

72.8 KB Created: 2021-03-12 14:57:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 85bff8da4334c0a558c37f2fb0bb3de7 SHA-1: 58647809066eba82bcf97e2ad8580a5b7342168a SHA-256: 8f65156a9f8e1dd3cd0e3dc301fdd091fb37c545d9de9a08ae77674f88e66712
126 Risk Score

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 0.9996

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://kuzutuzo.ru/award?keyword=cannot+search+a+pdf+file PDF link annotation
    • http://zodimevumu.22web.org/bovumapamobe.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/AtdgiLf/korefomifotufokikuj.pdfIn PDF document text
    • https://cdn.sqhk.co/vojazodelud/c3haDdM/32398263590.pdfIn PDF document text
    • https://kepubewi.weebly.com/uploads/1/3/6/0/136095452/javumopazu.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/9GtAVdO/32519152329.pdfIn PDF document text
    • http://zereteleriw.getenjoyment.net/birozijadekoz.pdfIn PDF document text
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/591bab48c7eb.pdfIn PDF document text
    • https://pisolapep.weebly.com/uploads/1/3/4/6/134648883/6197825.pdfIn PDF document text
    • http://xamojopilupivo.scienceontheweb.net/mary_balogh_chomikuj.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/walonanafatemuji.pdfIn PDF document text
    • http://durowan.sportsontheweb.net/daily_creative_writing_prompts.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/power_cooker_xl_rice_recipe.pdfIn PDF document text
    • http://fewemika.66ghz.com/75430502988.pdfIn PDF document text
    • http://mujusudi.iblogger.org/94409941256.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/liftmaster_la500_gate_opener_reviews.pdfIn PDF document text
    • http://mevakimuvu.mypressonline.com/comets_asteroids_and_meteoroids.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/interview_questions_and_answers_for_relationship_manager_in_bank.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tavokitewigi.rf.gd/buwareruritakunegodixo.pdfIn PDF document text
    • http://wegugoleta.onlinewebshop.net/81776073226.pdfIn PDF document text
    • http://kadozebozedakof.rf.gd/panera_boxed_lunches.pdfIn PDF document text
    • http://bideliv.rf.gd/thank_you_reply_email_for_appreciation_sample.pdfIn PDF document text
    • http://wonumamirevaz.rf.gd/network_scanner_apk_mod.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_off0000e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 5148 bytes
SHA-256: 7c236dc6767b817bd43b3de2186a76cbb2d0cb1b485d759d362bc0700e5284ed
font_01_sfnt_off0000f1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F6 10624 bytes
SHA-256: 97b0ebf2e11fd8722f2e838523e1aa1e3cbc515261609d0ff3319905dafde339

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