Malicious PDF — malware analysis report

Static analysis result for SHA-256 5910b251a0623e4f…

MALICIOUS

PDF

66.9 KB Created: 2021-02-22 16:57:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3bb045981b45703390b179a5f7335147 SHA-1: 82c4dc7733cc3885a14e17a77adb18b007ad3e30 SHA-256: 5910b251a0623e4faaeff60b123d8578741d2a63cc09cfa0596790d555e56f8a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a second-stage payload. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=top+notch+fundamentals+workbook+answer+key+pdf PDF link annotation
    • http://barojenixumaja.iblogger.org/adobe_sketch_android_tutorial.pdfIn PDF document text
    • http://detonic-ordina.website/legevuvawuzifegemosuricfst9.pdfIn PDF document text
    • https://bunepefetupudir.weebly.com/uploads/1/3/2/7/132741430/2171552.pdfIn PDF document text
    • http://allerop.xyz/decimal_number_line_worksheet_year_5cf8b2.pdfIn PDF document text
    • https://gidaletibom.weebly.com/uploads/1/3/4/8/134881461/6741454.pdfIn PDF document text
    • http://salleapp.xyz/go_pro_book_by_eric_worrepamv9.pdfIn PDF document text
    • http://makeyourself.xyz/45189407853ejrwn.pdfIn PDF document text
    • https://cdn.sqhk.co/bukoxomule/dhbTvgg/ufo_arena_2_deck.pdfIn PDF document text
    • http://ziragekezazu.iblogger.org/pafawizokubafaso.pdfIn PDF document text
    • https://leburivirabilaz.weebly.com/uploads/1/3/1/4/131453170/1378573.pdfIn PDF document text
    • http://detonic-ufficiale.website/9681692137cxnzz.pdfIn PDF document text
    • http://bet-info.ru/69226349045l0c6x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuzozan.epizy.com/is_peter_in_love_with_wendy.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_off0000c716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC716 5744 bytes
SHA-256: c2d5a24d9e51fd5dc8b725f8f39bd8467cfefa23d6157ea013165b60b20cdbd8
font_01_sfnt_off0000da84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA84 10528 bytes
SHA-256: c98e8fd4ec56f3d41dcad08658e0524031888f17b02ac28c54679fd902e9ef8c

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