Malicious PDF — malware analysis report

Static analysis result for SHA-256 e452ef6469a3dd48…

MALICIOUS

PDF

67.3 KB Created: 2021-04-06 18:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bc9593d8659cd5f8da383aaacb259b56 SHA-1: 299bfdce79eb7f77962416129ae9f4e89253aed2 SHA-256: e452ef6469a3dd48ea8e9f6eca3b07644dbd8967f80f36ca048c97e547f6bdee
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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://pelibifir.ru/123?utm_term=literal+equations+worksheet+algebra+1 PDF link annotation
    • https://cdn.sqhk.co/serojimo/agdghcj/pub_story_bar_renovation_breaker_games.pdfIn PDF document text
    • https://cdn.sqhk.co/mojuzizimu/b2kNrjj/camera_magic_trick_app_download.pdfIn PDF document text
    • http://itdomen.fun/zedavarotuzuseravozujasoc5yha.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/Giggfib/wood_wallpaper_hd_black_background.pdfIn PDF document text
    • http://testersairf.xyz/regional_anesthesia_books_freeebn7x.pdfIn PDF document text
    • http://tesar-krd.ru/37889018824v7m9u.pdfIn PDF document text
    • https://cdn.sqhk.co/nulogoxeja/Wie9wm6/jio_chat_app_android.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/hjfJTLk/hidden_words_picture_puzzles_with_answers.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/benuka/35192645520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d4150c-4992-4a05-89bc-6d2cfa571e81/41956388950.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_8e7791b0bd2c4ab59cb4536d888fa094.pdf?index=trueIn PDF document text
    • http://megutid.epizy.com/oracle_database_sql_tuning_guide_12.2.pdfIn PDF document text
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_e737acdcc295439f981c4273738ae738.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divexikav/xirisajenamida.pdfIn PDF document text
    • http://gagoxapedako.epizy.com/59561638593.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/norer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45417eff-5777-4607-8743-928878d34245/11530045129.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_off0000c9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AF 5360 bytes
SHA-256: f5e217254b970853e922d1d461e34a22232af507881488fb6eaa9d1d6a169962
font_01_sfnt_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 10064 bytes
SHA-256: 4c3477c35af7b69ea82f91126fbf97ba0b05b5ab799b796d84654566129a6934

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