Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5917e5a154f0c0…

MALICIOUS

PDF

74.6 KB Created: 2021-03-21 21:17:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f625be588e5c9cb2d828d3cb0216fe31 SHA-1: d3540b2d8f576abf1350656b961dbf7f7aab44ea SHA-256: cb5917e5a154f0c0e4ba0ee47d0d38b57dc39dc66c6f71c2e3ee0a3e63caeb4c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=how+do+you+program+a+toshiba+remote PDF link annotation
    • https://mavitebe.weebly.com/uploads/1/3/1/1/131163983/2931b9.pdfIn PDF document text
    • https://cdn.sqhk.co/manaruparil/bjfoSgf/ghost_rider_wallpaper_iphone.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/wadonodabu.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/bEhblic/jazogimojene.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/gdhcc5N/combi_microgolfoven_mediamarkt.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/ruteguzifa.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/iihgPhj/68664708751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407818/normal_600a24b3a0258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_600ba40cbc1bc.pdfIn PDF document text
    • https://zorimogitew.weebly.com/uploads/1/3/4/4/134487520/wususugivip-jonagogemavilu.pdfIn PDF document text
    • https://zisefedid.weebly.com/uploads/1/3/4/7/134767142/sefogaka-xexotojarafa-vinokejin-kiworatedawe.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/high_school_physics_textbook_mcgraw_hill.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/fodose/36913416620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5019bc2-5e58-4bef-9de8-af01665e0bf0/85339885901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78be641a-a6e3-4850-9c65-c73a7dd2d155/45162608997.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/juzusirabekow.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/34645045102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f14a8b69-a0fe-4bd0-85c6-7b2baff8979d/how_to_connect_sony_ht-ct260h_to_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/68558183479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/248999c3-cc9a-408a-abb6-80f03fa9a9b9/49015578891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e7dcfaf-82de-4f91-9fd5-5b56a4bb19ea/99284476296.pdfIn PDF document text
    • http://muzulozak.atwebpages.com/57028736802.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/lanefujidodajadiwesisu.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_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 5636 bytes
SHA-256: be81d5958e716c991fdf57fbb3b9ac4bf0fc92dc124891afebfac92493f1a1f8
font_01_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 10516 bytes
SHA-256: 73fefefe40fcc777beceb17882dd15bc215ae25499faf9e890d0c46b7509954d

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