Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcaadc9f8c96d07a…

MALICIOUS

PDF

70.9 KB Created: 2021-02-27 10:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 072cfe5545981502ed0786bfd014ba3f SHA-1: 4d7a73548ab482fd0f5089293cd51096e08caec2 SHA-256: dcaadc9f8c96d07ac9decf4ca90a33e2aa0e3ca0c01a0c7a69ef9e8fb63f4af1
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically pointing to 'jacksth.ru/strik' which is indicative of a phishing or scam attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests malicious intent by identifying the PDF as a link farm on disposable hosting. Although no scripts were explicitly extracted, the presence of numerous URLs and the ML classifier's high confidence score strongly suggest this PDF is designed to redirect users to malicious sites.

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://jacksth.ru/strik?utm_term=how+to+repair+a+typewriter PDF link annotation
    • https://cdn.sqhk.co/daxerarugak/djetgj6/79370253186.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/dell_keyboard_km632_not_working.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/77353445437.pdfIn PDF document text
    • https://kewupadaduroj.weebly.com/uploads/1/3/4/6/134689326/remujijatapajamap.pdfIn PDF document text
    • https://cdn.sqhk.co/kedetofido/2Cgghbv/starlink_beta_sign_up.pdfIn PDF document text
    • https://kifakofaw.weebly.com/uploads/1/3/4/0/134016777/gipilatafivon-kuvezoxuluwo.pdfIn PDF document text
    • https://lutovadefok.weebly.com/uploads/1/3/3/9/133997447/sakada_japefotu_sotekegokisoga_fenekiretetumu.pdfIn PDF document text
    • http://xavubizuj.22web.org/bootloader_for_windows_7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fekuzigide.epizy.com/wixanideg.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/rolajipobapavufugolugox.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/24373847146.pdfIn PDF document text
    • http://welokaj.rf.gd/star_spangled_banner_sheet_music_for_flute.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/kujukifuxaramup.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/xaleke.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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 4756 bytes
SHA-256: 5860c21a9df2d9f0737da3c56ff9f324cb54f05ab79c6deaebf9c8e2656adcda
font_01_sfnt_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 11040 bytes
SHA-256: 1b57277523e1de90b93a03ebc4bf7286209b08038347d239160725f1ffc74ba7

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