Malicious PDF — malware analysis report

Static analysis result for SHA-256 69ec85aff94c7922…

MALICIOUS

PDF

75.9 KB Created: 2021-01-30 06:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 562393ec9324d5c329336251bb040570 SHA-1: c6077a4237db3c68742e19bb416a21764adaed9a SHA-256: 69ec85aff94c7922e123328245eb6b8341dc0599bc1cb49c71ec611b0a7c66fe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file, disguised as a handwriting worksheet, contains numerous embedded links pointing to external websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=handwriting+worksheet+for+2nd+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416151/normal_5fd652724f722.pdfIn PDF document text
    • https://cdn.sqhk.co/juzivadareka/iRiajjC/royal_family_news_update.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_5fe706e839e56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_600f2df11b63c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365620/normal_5ffe28513cb33.pdfIn PDF document text
    • http://hookup154.space/lebugibufavifazuwoggvm2e.pdfIn PDF document text
    • http://immorta-cross1.club/banco_do_brasil_pessoa_juridica_chave_j7w0tr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373998/normal_6000b10aa61d3.pdfIn PDF document text
    • http://sait-ok.ru/89190694420ifmot.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/1dlBjgB/juzovitavipuseravafolu.pdfIn PDF document text
    • http://thiswaytovogue.com/mishary_al_afasy_song_mp32lknp.pdfIn PDF document text
    • https://cdn.sqhk.co/nulegudup/Vjciaie/kozusekagoxusazapesaxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5fc986d54e623.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/cjNQicm/8605456314.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423780/normal_5ff10c4244aa0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wejuvono/exercise_guidelines_in_pregnancy_new_perspectives.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/xopapopusofeguvexikeg.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 5176 bytes
SHA-256: 424f0e8b8463cf5c8c46fe80fa68f638fa13bb6b299c695b9122575f8507d6bd
font_01_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 10852 bytes
SHA-256: cd9aa6136a9e70c664a232d9de5b3dd85143eabc591ebaf2fe777fd487493500
font_02_sfnt_off000113f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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