Malicious PDF — malware analysis report

Static analysis result for SHA-256 983ec7cca4ab316a…

MALICIOUS

PDF

64.8 KB Created: 2021-03-12 18:10:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a89f345bf1525a1fd8faf6d2760ed330 SHA-1: 15830f546fa8473e6a33d7978acd06ae3dcae814 SHA-256: 983ec7cca4ab316a83f7130e996809d81febda079d973ce8f52886bdd55e5537
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

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://midufefew.ru/wix?keyword=best+unblocked+games+happy+wheels PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366407/normal_5ff7667b55250.pdfIn PDF document text
    • http://sberin.xyz/wututiwejodikelavuwubik9quf1.pdfIn PDF document text
    • http://pexarinolal.mypressonline.com/82181359401.pdfIn PDF document text
    • http://gobigs.space/latapemuahrm0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383698/normal_5fcecef38ca9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416811/normal_5fd2dae20f7b6.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/7ibiiAc/fitabadebegizafovadutur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_600f04fc43116.pdfIn PDF document text
    • http://english-10.site/what_comes_after_the_fall_of_fivecd9ya.pdfIn PDF document text
    • http://zipafaxelati.sportsontheweb.net/gmat_practice_test_2020.pdfIn PDF document text
    • http://biomanua.website/xeduzekolezazewijevubavpnk79.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/hWidggd/49513330364.pdfIn PDF document text
    • http://paxosij.mygamesonline.org/how_does_the_after_book_series_end.pdfIn PDF document text
    • http://insta-sale.site/optoma_dlp_projector_manual17dps.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fefolitaweni.epizy.com/30731664942.pdfIn PDF document text
    • http://lobanegogoriwem.epizy.com/600_essential_words_for_the_toeic_3rd_4th_edition.pdfIn PDF document text
    • http://sevixazoma.rf.gd/wivumelafapug.pdfIn PDF document text
    • http://zozoresupiz.epizy.com/challenger_technologies_limited_annual_report_2017.pdfIn PDF document text
    • http://kisezemewarajox.rf.gd/american_english_file_5_test.pdfIn PDF document text
    • http://wigezenefibi.epizy.com/80210609147.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_off0000c140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC140 5836 bytes
SHA-256: fff5ae02774ceaa1cf3d9e8266e059a1d5b3f22beb9e03406afd900811dd4e44
font_01_sfnt_off0000d513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD513 9616 bytes
SHA-256: eb01f3abda98428ef658b83352ee9e155980e3f5566918f7a21caa3b69f6c61c

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