Malicious PDF — malware analysis report

Static analysis result for SHA-256 f733d7a69d715820…

MALICIOUS

PDF

79.1 KB Created: 2021-04-11 00:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 90982c1f487eb4e47f00fa6db13dc4b3 SHA-1: 9bea9d777a7b9ad7057cc9e62fed89b3ce67536e SHA-256: f733d7a69d715820fb2ce8fca7447a64243d21b6b0399601b0393032733f0ac0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/strik?utm_term=how+to+change+the+time+on+a+keurig+coffee+maker PDF link annotation
    • http://daating19.site/android_studio_masterclasshxurw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415546/normal_603ee0159701d.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/hg5Nico/kerulem.pdfIn PDF document text
    • https://cdn.sqhk.co/nagebagem/Mhfghhj/island_in_the_sun_by_weezer_lyrics.pdfIn PDF document text
    • http://liketime.online/krishna_ji_ki_bansuri_ringtonenh2og.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378379/normal_5fdfc50b8977d.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/55641915338.pdfIn PDF document text
    • https://cdn.sqhk.co/sibamoxa/bgiijgi/debibitovenitu.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/haigeib/maxisys_elite_update.pdfIn PDF document text
    • http://cardioactiveuficiale.site/radio_shack_handheld_scanner_manualdkvos.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/91913839981.pdfIn PDF document text
    • http://netewe5.xyz/mega_emerald_x_and_y_cheats_master_bcxuba.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/ihjhgX1/dotapatab.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/2HujguK/horizon_drive_grand_junction_colorado.pdfIn PDF document text
    • http://dreamingdeveloper.com/refadagobinobakifabevil5hdgz.pdfIn PDF document text
    • http://reduslim-italy.site/difference_between_hawt_and_vawt_pptokp9w.pdfIn PDF document text
    • https://cdn.sqhk.co/zolaxadivowe/fNShbjh/36342246022.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duziroro.myartsonline.com/what_if_marvel_episodes_names.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_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 5200 bytes
SHA-256: ae08e2ee741bd2e61854ded8c14f642873e71e078203f4d990f28e3578056284
font_01_sfnt_off00010936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 11056 bytes
SHA-256: f81eaf1e0c049dfc5c0b1e3eb1e4dcccbc08763d9d4eb7826d7509524be56fb7

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