Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52808d7bb3f83ff…

MALICIOUS

PDF

103.6 KB Created: 2021-02-22 20:09:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c4eb635f857f0774eacc48c7135f6667 SHA-1: 50aa021e3eca1d381965d295b598c7f877df104b SHA-256: b52808d7bb3f83ff0713b18be83d77f97e8d66bc456eaa49c074edddb52e66d5
186 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, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://jacksth.ru/wix?keyword=play+scary+maze+game+2+unblocked', is presented as a search result, likely a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

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://jacksth.ru/wix?keyword=play+scary+maze+game+2+unblocked PDF link annotation
    • https://cdn.sqhk.co/widobixi/PT7hhzm/music_player_programs_for_windows_10.pdfIn PDF document text
    • http://topcreditreport.info/dixiladovibokd4t.pdfIn PDF document text
    • http://vofefipegurixu.iblogger.org/adivasi_film_hero.pdfIn PDF document text
    • http://coolvdomaion.online/kenmore_washer_and_dryer_stackable_repair_manualem7v4.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/eaqibLZ/hot_videos_of_klaus_mikaelson.pdfIn PDF document text
    • http://pearhaidhr.fun/tuzurevugirixewaabda.pdfIn PDF document text
    • https://cdn.sqhk.co/lupokuna/bJjfhaj/nekudimawesasevalunatozid.pdfIn PDF document text
    • https://cdn.sqhk.co/xeliwiwogivo/iajg9gg/towowageburasopewube.pdfIn PDF document text
    • http://ralujafinis.22web.org/comedy_circus_video_free_mp4.pdfIn PDF document text
    • https://pawawejovotete.weebly.com/uploads/1/3/2/8/132814611/60a6b38fe.pdfIn PDF document text
    • https://cdn.sqhk.co/lufelumad/hcOciaR/33013777817.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://javoxowixeb.rf.gd/88879173235.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/pinagosomezoweropej.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/kokuromasexoj.pdfIn PDF document text
    • http://vovokab.rf.gd/filuzonidezuru.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_off000158e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E8 5748 bytes
SHA-256: 44bbacc0fb5d08ae8561a0d331102a51c7bcc753355b59c4abb4ce4c19206cfb
font_01_sfnt_off00016c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C81 10704 bytes
SHA-256: 0f551dc0c2230d8cc1be895eda77407078947876e2e2342025fa4cfb18099027

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