Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14ef098eec4c4b8…

MALICIOUS

PDF

76.6 KB Created: 2021-04-05 20:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3931cb94d40f5ecfbd1fa5894457117d SHA-1: 767b4909f2651c57a1fac54f042a8331814bcc5d SHA-256: f14ef098eec4c4b8eba451a26014fbe546de69bb85d745cd3214ff26c304bb9d
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9997

Heuristics 4

  • 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://kuzutuzo.ru/award?keyword=ada+diabetes+2020+pdf+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/fabozesemi/enhdheJ/science_vie_junior_age.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_6050750593014.pdfIn PDF document text
    • https://kukutapiroboj.weebly.com/uploads/1/3/4/7/134712573/2501216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_60233401abd75.pdfIn PDF document text
    • https://fuzipoxo.weebly.com/uploads/1/3/0/8/130873840/c87595839b952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471512/normal_605a20650bb92.pdfIn PDF document text
    • https://cdn.sqhk.co/bozutebux/i7QLhdK/acceleration_of_gravity_length_formula.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/gcB1wjh/facebook_premarket_stock_quote.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/gdSqSic/xolunujex.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/iie6Kui/firefibejowibuwanekuwur.pdfIn PDF document text
    • https://dodezugufiz.weebly.com/uploads/1/3/5/3/135331092/6045445.pdfIn PDF document text
    • https://cdn.sqhk.co/jorisuzil/hgfifoW/28142671900.pdfIn PDF document text
    • http://subumobo.22web.org/2073961589.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/solonebosop/97084239668.pdfIn PDF document text
    • http://vomematomeze.epizy.com/hotels_with_jacuzzi_in_room_near_washington_dc.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/cc_and_bcc_full_form_in_email.pdfIn PDF document text
    • http://rorexutika.rf.gd/lexinixu.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/pufitidufumenovupowezaj.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/java_game_god_of_war_3.pdfIn PDF document text
    • http://muwojes.epizy.com/dafiniduda.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/you_know_me_piano_sheet_music.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_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 5556 bytes
SHA-256: f89b6d359c601d736e8d77906d89b96e037dc1694bbd975ea2cbbeaaee5d13f0
font_01_sfnt_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 11360 bytes
SHA-256: 987248d7ab19d3ebfa07aa7124987f7a75f836ce07f7480aebca1ffea9ca398a

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