Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f5758f5f009986…

MALICIOUS

PDF

73.2 KB Created: 2021-03-30 05:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ba5282a39293f73f8740e663e083fd6c SHA-1: c5da5a58630f647be10b0bc83c8b3754b68165be SHA-256: b8f5758f5f009986e9ee1474503d65e5206940c98edd3fd180b249eedf839f01
134 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 ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=equation+of+a+circle+word+problems+worksheet+pdf PDF link annotation
    • http://lofitner.buzz/801948980962psj7.pdfIn PDF document text
    • https://cdn.sqhk.co/tomibigi/cTbsLjg/rc_car_track_wisconsin_dells.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_5fd34d7de5815.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/yiiiagd/gsmarena_pixel_5.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/djgsyhh/6442337366.pdfIn PDF document text
    • https://cdn.sqhk.co/sosexazefip/mbgcWij/polly_the_talking_dog_tiktok.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/DxuKpjb/69505223451.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/3lgjLgh/bain_insights.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/hj2qWjc/wexix.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/c_2012_programming_black_book_free_downloadz1q42.pdfIn PDF document text
    • http://tanubujurutemut.scienceontheweb.net/lasizinupegupusuki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448328/normal_5ff166f6c967c.pdfIn PDF document text
    • https://cdn.sqhk.co/lijusute/hhjiLXQ/traffic_accident_investigation_equipment.pdfIn PDF document text
    • https://cdn.sqhk.co/puwetudul/dIyEggS/32683415587.pdfIn PDF document text
    • http://donbetosstreettacos.com/kenworth_owners_manual2vobi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujobope.atwebpages.com/why_zinc_is_more_reactive_than_copper.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/juwatakuzesepapifige.pdfIn PDF document text
    • http://nozozuwovore.atwebpages.com/wanotu.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/fatoziwakijo.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/7175367099.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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 5776 bytes
SHA-256: 089e1b2750c82403f8ed1ea876e91ca77ecf6131cca84fe63af28cecb5153141
font_01_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 10872 bytes
SHA-256: 0b1b4fe393a59840a74ca42af4f63ea33396cfdb41bc288c00fa28cd69464ff9

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