Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbcd32f653d3f76…

MALICIOUS

PDF

80.2 KB Created: 2021-02-21 21:49:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c94fb4d304ad9fa7bfbcff818c4013f6 SHA-1: 2d44984f7acc2b189b0993c6e8f85aa0eb61e19c SHA-256: 0cbcd32f653d3f76cf44da7bbd828a493be2ea81261a9afee80fbeb0aceb5d80
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to lead users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=maulana+rumi+40+rules+of+love PDF link annotation
    • https://cdn.sqhk.co/sabumijobude/jhbicmm/39607057028.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/hyihfQh/pirakitanamuropupiguwumel.pdfIn PDF document text
    • https://cdn.sqhk.co/wetaxawirewu/hhihcjf/3610461035.pdfIn PDF document text
    • http://redita.fun/cms-_2728_esrd_medical_evidence_reportlovb7.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/hibicaX/hot_korean_pop_music_videos.pdfIn PDF document text
    • http://raisinshq.pro/jexixakebipigenapinigasowe4289.pdfIn PDF document text
    • https://resewirebibabap.weebly.com/uploads/1/3/1/3/131379054/7103dcfe1b3a.pdfIn PDF document text
    • https://dekajemo.weebly.com/uploads/1/3/1/4/131453049/tozodimijitovus.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/befexovosogouh611.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/depagotoxowemugiwu.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/kewuxejikiwe/xeparolozanogak.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/17598456898.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/nixewarem.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/chura_liya_hai_tumne_song_likewap.pdfIn PDF document text
    • http://mokisomalew.rf.gd/descargar_twitter_apk_uptodown.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_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 5208 bytes
SHA-256: a9b092e24d6446131cc7599ba96265b05711f04b286f2bd774c5434968f72b01
font_01_sfnt_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 10980 bytes
SHA-256: 72669581310e1543f2161e1623c80536aa9b0a1843b390becf3890b351f56f6d

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