Malicious PDF — malware analysis report

Static analysis result for SHA-256 182e4fb17d612435…

MALICIOUS

PDF

69.5 KB Created: 2021-02-06 14:18:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d3bc9a1b97fac611c6358c4d99090248 SHA-1: 620965bbe5d75d1e05994bd4851e5337d23235f1 SHA-256: 182e4fb17d61243519674cfac0339214333806b03bb5690c8ee8aede0e96c125
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

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/wb?keyword=upper%20and%20lowercase%20alphabet%20writing%20worksheets PDF link annotation
    • https://cdn.sqhk.co/sixepatexup/5Xhizvd/sewobexamixuw.pdfIn PDF document text
    • http://service-hire.com/vinisivotabedinun0hl5v.pdfIn PDF document text
    • http://ranking-se.com/95181255238kv0hz.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/ihiUjf3/29955642837.pdfIn PDF document text
    • http://english-10.site/popjam_app_downloadxh2sm.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/jEihThg/69459698975.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupesiparu/ij5jdgh/kedevufu.pdfIn PDF document text
    • http://zaliv2k20wowowowoow.xyz/madness_combat_project_nexus_2gifjp.pdfIn PDF document text
    • https://cdn.sqhk.co/vojasipi/Ihbhj7v/dupupelevago.pdfIn PDF document text
    • http://rating-bookmaker.ru/sazitn75ir.pdfIn PDF document text
    • http://hookup158.fun/81492643698s2id6.pdfIn PDF document text
    • http://clientesdkb.com/flightradar24_gold_8.1.1_mod_apkz1w9w.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/L9gfjdY/clicker_racing_prestige.pdfIn PDF document text
    • http://komarovskii.xyz/36867791947x0af9.pdfIn PDF document text
    • https://cdn.sqhk.co/tedogegez/khaij1I/kijulaloxeweforefa.pdfIn PDF document text
    • https://cdn.sqhk.co/zanudiwageg/yAYGic5/xebev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fajesunuk.rf.gd/bluetooth_driver_for_hp.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/anthropomorphic_stele_form_function_content_context.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_off0000d26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26C 5624 bytes
SHA-256: d6d125d0a762bd8665cba738f68795b0b944852f7ddea769fb13235d9ed08023
font_01_sfnt_off0000e58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 10272 bytes
SHA-256: 3e499131e3e82914be90f76bcace83bf2bec5aac2b785d10a5db14d40fa105e3

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