Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18c527fd8529301…

MALICIOUS

PDF

71.4 KB Created: 2021-02-03 21:00:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ee93056d393f3944458f832deabb9389 SHA-1: 1af88229fe493afd23dfb1b4a2351d173fd0cc86 SHA-256: e18c527fd8529301ccd8967db7a52a551cf76805857131cfcfe105f33c19a239
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/123?utm_term=horse+head+anatomy+for+artists PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385859/normal_5ffe8db76cea5.pdfIn PDF document text
    • http://merishwheelrecords.com/human_physiology_free_downloadz4oex.pdfIn PDF document text
    • http://marinarus.space/mobile_defense_warframe_rewardslce41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_5fe79506342e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407804/normal_5fe25c312853e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386089/normal_5ff96baf737db.pdfIn PDF document text
    • http://razvivatel.blog/iq_test_free_downloadxv7vu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453579/normal_6007feac457f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453550/normal_5fd6292c5cd37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375339/normal_5fcecd1101227.pdfIn PDF document text
    • http://vemasujananexu.22web.org/because_i_m_stupid_piano_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459641/normal_5ff9d692e99ed.pdfIn PDF document text
    • http://pimavegi.22web.org/bazenolibanap.pdfIn PDF document text
    • http://xplaintome.ru/40951360060jad9h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabapuxamiluj.epizy.com/89350110983.pdfIn PDF document text
    • http://puloxivomavari.epizy.com/4857225582.pdfIn PDF document text
    • http://fetijuvutod.epizy.com/antithrombotic_and_thrombolytic_therapy_guidelines.pdfIn PDF document text
    • http://zegemipufe.epizy.com/android_device_manager_visual_studio_not_working.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_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 5180 bytes
SHA-256: 74244aa03372f044cde6cd98bd70fc559008099e0df7b13f83b2213c0ec9f9d7
font_01_sfnt_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 10132 bytes
SHA-256: b531d603d179444ac9b1aeea2f96164abab06acf8cef99f251894e9c60fdeffc

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