Malicious PDF — malware analysis report

Static analysis result for SHA-256 6691902b367206d9…

MALICIOUS

PDF

72.5 KB Created: 2021-02-24 05:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 862c3f3584d06638e5bb4eb39d940015 SHA-1: a2851df0c3ffa819a18ade3365178f10dd9a123f SHA-256: 6691902b367206d944a930af2fa5edfc9497d420030e79b91e5e78d58f03cc18
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains heuristics indicating it is a link farm and a lure for browser extension installation, disguised as an invoice or payment notification. It also contains external URIs pointing to potentially malicious domains, suggesting it aims to redirect users to download malicious content or visit phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jacksth.ru/123?utm_term=ti-84+plus+ce+graphing+calculator+walmart PDF link annotation
    • http://ighelpcenter.xyz/ajuar_funerariopkttc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_601ec6bd6227b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412895/normal_601819eed0244.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/ZYHqgcs/photo_video_mixer_app_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387240/normal_6006717c2cd49.pdfIn PDF document text
    • http://laura-egorova.ru/2014_mustang_brochures03z7.pdfIn PDF document text
    • http://vkrowl.com/22496316470fu1hr.pdfIn PDF document text
    • http://tublitalia.space/java_jdk_win_7_32_bitxxhhy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447273/normal_601dae5c4647b.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/download_beauty_and_the_beast_movie950op.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450037/normal_5fd03a606f692.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zesixefe/vumijujuforisijesewoxijin.pdfIn PDF document text
    • http://zemadepa.rf.gd/baghban_movie_audio_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/geico_app_link_report_claim.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_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 5700 bytes
SHA-256: 49b7d4de8de943dfc779424c672a7fa2c7b300cda84fdd744df5771c0b487e07
font_01_sfnt_off0000ef51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 10704 bytes
SHA-256: febcf95c98933dc31ab4f5e42bd99fe693fbbfa4fcad24f629ab63bd56709fe4

Open this report in the interactive analyzer, or submit your own file for analysis.