Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0ff3776dc1de31…

MALICIOUS

PDF

73.9 KB Created: 2021-02-12 22:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 09e5305ebed3f8422f916462aed0ec4a SHA-1: 18fedf9309cdf1a9def253e0d07971b8c10ca5dc SHA-256: 2f0ff3776dc1de31d5ebff6ac23a1134769d8b87b62a935fb09c8dde20986b8d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/wb?keyword=billboard%20hot%20100%20%202015%20zip PDF link annotation
    • https://cdn.sqhk.co/sadebupunen/fShf9jb/argentine_war_of_independence_facts.pdfIn PDF document text
    • http://soldonlakewood.com/balerato_masione_songplx7f.pdfIn PDF document text
    • http://pressit.space/update_mysql_database_php_formnpxj4.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/1TmNxhh/89475362475.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/ihtUTtS/76559741743.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365621/normal_5fcc94b531eb8.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/jdjfldq/oxygen_sensor_cost_car.pdfIn PDF document text
    • http://soinjaga.ru/batakilijajagofajesatxbw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392667/normal_5fd785af4e64d.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/RLhjbfu/strawberry_ice_cream_sandwich_cake_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/jbjaiaD/16185377673.pdfIn PDF document text
    • http://kalavar.xyz/siemens_qp_breakergyxl6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414353/normal_600747d849337.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/davubewu/suditetowuzobulozefozore.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/irpf_2019_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/annabac_maths_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/demon_s_crest_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/zabajisuxapu.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_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 5560 bytes
SHA-256: 26b650c6cd6a3f6a954dfcc3eed69fd82a7e6e252584183b4708ac9c2025eee9
font_01_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 11948 bytes
SHA-256: 781b570d3153d1ab6fc9a0a2fff3083a4d9d222a4b66a7b0acfeb149b7e6fa6c

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