Malicious PDF — malware analysis report

Static analysis result for SHA-256 98772c4556565abb…

MALICIOUS

PDF

65.9 KB Created: 2021-02-17 02:33:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fbceb93b6709dc4abff7631adf24a614 SHA-1: e6128bd1f1659a1808f2cfea12225bec09ac6b5c SHA-256: 98772c4556565abb7acb3ae241d3e117849cfc10436578b891747981a556752a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content.

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://maypoin.ru/strik?utm_term=kenmore+elite+oasis+washer+lid+switch PDF link annotation
    • https://cdn.sqhk.co/gijosevozu/gehb8hj/english_grammar_lessons.pdfIn PDF document text
    • http://jirafka.space/25931795528pf8cn.pdfIn PDF document text
    • http://laura-egorova.ru/admin_template_html_bootstrapoijae.pdfIn PDF document text
    • http://petrol-v-pol-price.site/vojulagikqalm7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456119/normal_600bc9cd97e5a.pdfIn PDF document text
    • http://onlyforyou.space/sasirararatix3sbie.pdfIn PDF document text
    • http://nekretnine.site/zombie_catchers_codes_20197qyob.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/XcgighW/97831042543.pdfIn PDF document text
    • http://smirno.life/95226032396xxlf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5febd10f8fd18.pdfIn PDF document text
    • http://discovljzg.fun/makine_elemanlar_birsen_yayneviyzdw2.pdfIn PDF document text
    • http://bloodcraft.online/22191018745bk5it.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415546/normal_5ffed0e156d77.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/6Azjbhg/bomesotatotu.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/gewisetug/integer_word_problems_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/refudomifisiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/banaraxujozesola.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/grama_sachivalayam_hall_ticket_date.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/gasisebetabuxuniduderogo.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_off0000c741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC741 5240 bytes
SHA-256: 0ba66f87ca12b8c2474bcd0dcef23bf0eb0bb5422e62d6c7abe63c1e2c849592
font_01_sfnt_off0000d8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 9828 bytes
SHA-256: 7a0071969f1530c4f63f6a387071ef0e1e1b6340af2533fd399edff98f6b9c19

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