Malicious PDF — malware analysis report

Static analysis result for SHA-256 970bd9612dbe1105…

MALICIOUS

PDF

85.7 KB Created: 2021-02-12 22:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 700f20955643d83043194de093080caa SHA-1: dfe2c0d6a059d1277b5c3d3ecad56becac91e12e SHA-256: 970bd9612dbe11053536a18b35bb8eba4e78a8c6484801b0bf09faa9ddf9ae82
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true malicious destination.

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://jottigo.ru/wix?keyword=how+to+hack+st+math+to+get+to+100 PDF link annotation
    • http://4escam-bot.online/givukabenutawe42ary.pdfIn PDF document text
    • http://themarkuzmusic.com/customer_service_cover_letter_template_freeek1pl.pdfIn PDF document text
    • http://netzamka.ru/solidworks_2013_bibled3w0q.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/pkjgBgi/dololinifibemu.pdfIn PDF document text
    • http://tradebot.space/tamil_adithya_varman_songse1v53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_5fe77f16e9e39.pdfIn PDF document text
    • http://songkfrk.site/gilan0vtey.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/4icKjhO/tnt_mod_minecraft_1._14._4_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jasekazus/KTEggjc/lords_mobile_dressing_room_vip_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/gjdPje6/38022963647.pdfIn PDF document text
    • http://marafonsport.site/bubble_shooter_birds_gamei8tms.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/fhifnhj/tezoxeroxigisugawopazika.pdfIn PDF document text
    • http://justiciaforjustice.com/degrees_and_radians_worksheet_answers2sfd1.pdfIn PDF document text
    • https://cdn.sqhk.co/someteku/nphjcjh/day_r_survival_premium_apk_hack_2019.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
    • https://s3.amazonaws.com/dozuga/kitosavaludivefizawun.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_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 5032 bytes
SHA-256: 8c33009b29c0e191ed4f187e590611783ec7c294004946431db2f10931156ab1
font_01_sfnt_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 10852 bytes
SHA-256: 28645b3cc08420c2c7affc605a63ee6d6010e2caf9935a622c34ce1e6e33fe49
font_02_sfnt_off00013c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C11 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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