Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfca5b0701a3d751…

MALICIOUS

PDF

74.6 KB Created: 2021-03-04 12:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8f326f3ecbadb740358216835673c587 SHA-1: c25de7840070188a5ae1d1677b000b878e0696c6 SHA-256: cfca5b0701a3d751588b1cd7ee340e46e2e8917eec1b25ba74c8846690dfd7e7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO manipulation or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious activity. The file's purpose appears to be directing users to potentially harmful external 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://nipisod.ru/strik?utm_term=new+twilight+book+2020+midnight+sun PDF link annotation
    • https://cdn.sqhk.co/davusegeb/jbLghii/zezuru.pdfIn PDF document text
    • https://golakabuzoved.weebly.com/uploads/1/3/4/8/134870140/fotenobetiw.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/2ib8hdy/duck_donuts_culebra_commons_san_antonio_tx.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/jgT2lZZ/74643167186.pdfIn PDF document text
    • http://larebalin.mypressonline.com/ziroxenasiziwujum.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/eihelBu/87681780458.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/gehcHjs/dikopu.pdfIn PDF document text
    • https://tibikinadip.weebly.com/uploads/1/3/1/8/131856726/kakavefeguwuxoni.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/giUgc3o/22083177816.pdfIn PDF document text
    • https://cdn.sqhk.co/moxasapiwer/heWkwp5/parixe.pdfIn PDF document text
    • http://dopogabijup.mywebcommunity.org/your_grace_is_enough_lyrics_and_chords_by_hillsong.pdfIn PDF document text
    • http://sukutoxuwurif.mywebcommunity.org/36331044981.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/jekekudezewatozoduwu.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/XONiigc/31647604398.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/dFcuFor/86532373727.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ligoroxenafof.atwebpages.com/guitar_tabs_lick_it_up_kiss.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_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 5472 bytes
SHA-256: 1486039baa517f376b0f1e90d3b8f80dcf9f54889f7aaefe70b0c2b7b1698f66
font_01_sfnt_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 10204 bytes
SHA-256: 306220e0fc29104122f254e08be725853b3ee068d97f8b042699967a38ec5b41

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