Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47dc549c1e0c012…

MALICIOUS

PDF

67.9 KB Created: 2021-01-31 01:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 71bc80f0ad1e765be7b52bc11ea07084 SHA-1: ec2ef9db386f093defcb3a72a31f07cbd9cd79f4 SHA-256: f47dc549c1e0c01298dfc9f540d7cc6dceac34a4b63b84ebc0ef73db2e747c8f
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to various external PDF documents. The embedded URLs and the heuristic findings strongly suggest a phishing or malware distribution attempt, masquerading as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/aws?utm_term=simile+exercises+with+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/xekemini/icjjdpR/pabob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417137/normal_5fd0e9fdc2a5b.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/9FBsgfD/rome_total_war_barbarian_invasion_cheats_ipad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_6009d885d99fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371787/normal_5fe155892cf38.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/e4BR2hr/9135188144.pdfIn PDF document text
    • http://bettermoneytips.com/cavalleria_rusticana_novella_verga36zg5.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/fGihij4/mighty_minutes_78_hello_friends.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/xewud_xuxeka_musazede_sujede.pdfIn PDF document text
    • http://auto-fishing-rods1.club/518742141475y16q.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/xuzed/takaxanoxagixozir.pdfIn PDF document text
    • http://vanabigura.rf.gd/google_maps_uk_street_view_free.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_off0000cade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADE 5660 bytes
SHA-256: ff4306383c653949750320d5e2cc8ab0724c651166cdf7c2b881cf847b33c9a7
font_01_sfnt_off0000de0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0F 10740 bytes
SHA-256: c87a15d1e50b001414126995e4e971c2fbf6afb84fdead81d7a58cf14bea7630

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