Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ee3d5e305a24a2…

MALICIOUS

PDF

68.9 KB Created: 2021-03-02 03:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e9fac8194c95e694aceb3d82b1a61488 SHA-1: 1d427c06363ddcaa982d0becd24e7474c67343eb SHA-256: 53ee3d5e305a24a2ec4172cc980fad02aa457cbd362219f134c1e5dea4f369f7
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 0.9998

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 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://baarspo.ru/award?keyword=how+to+calculate+concrete+pressure+on+formwork PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448116/normal_6011aad96ef6e.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/lafunipet_simokikuzalekow_kuzew_lewubatasinedir.pdfIn PDF document text
    • http://dujalubudekir.22web.org/wowoxizexepatafitiru.pdfIn PDF document text
    • https://cdn.sqhk.co/pijavagoke/cjahhhd/kazigapubezit.pdfIn PDF document text
    • http://copyrightsupporteds.com/wevedamatatonakajubuki5nm.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/can_a_trustee_buy_property_from_the_trust.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/gobobodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412593/normal_602984441d45b.pdfIn PDF document text
    • https://tetoxoji.weebly.com/uploads/1/3/0/9/130969306/1447995.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495999/normal_5fcb7ac9be011.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/anatomia_de_cabeza_y_cuello_gratiscs96p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448985/normal_5fd6a7f3b5948.pdfIn PDF document text
    • https://fewegako.weebly.com/uploads/1/3/1/4/131453302/jisewuvijug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijemawijopetu.epizy.com/befuxag.pdfIn PDF document text
    • http://lipabarud.atwebpages.com/how_to_find_the_angle_measure_of_a_polygon.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_off0000d25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25E 5280 bytes
SHA-256: 70dbe0115f511c55e6b8f605395d32236d318337ba64bed7d19ceb63ffffecad
font_01_sfnt_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 10104 bytes
SHA-256: 2062de62394300f9fe590646ae4b1a1729c12a3d9f86759405d1bcd91d120430

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