Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34aa93110121b05…

MALICIOUS

PDF

73.1 KB Created: 2021-03-25 09:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e8af34533967548740981d4ef07b8cbe SHA-1: 9294651f02f308d7d54b80c0a91c77a4a33106d6 SHA-256: e34aa93110121b05a6019eadc3891bc5abd4d9227d151d9c7a5c09c5acc75b89
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-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://druttle.ru/wix?keyword=how+full+is+your+bucket+pdf PDF link annotation
    • http://wavapivanuf.scienceontheweb.net/buteo_nitidus.pdfIn PDF document text
    • http://bet-info.ru/81327033240pfdtv.pdfIn PDF document text
    • http://kurekarer.22web.org/10818739955.pdfIn PDF document text
    • http://italysummer.space/nonton_streaming_nancy_drew_season_1pbq1l.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/will_the_lg_stylo_5_get_android_10.pdfIn PDF document text
    • http://stav-games.ru/the_art_of_shin_godzilla_zipoomyx.pdfIn PDF document text
    • http://kegujusotuk.iblogger.org/motivation_letter_for_bursary_sample.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/92183695595qb8ec.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/1954_johnson_seahorse_5.5_hp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead5735a-b77d-4822-ba4d-1b7ec3cffde8/how_to_write_a_character_analysis_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be6b3462-1c3f-422a-aea1-ea0648e0e0be/39094997645.pdfIn PDF document text
    • http://telosizaba.onlinewebshop.net/wiraxozegokifiwizidezuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1e8c577-a3e6-4630-b65e-e223902a924e/49356999722.pdfIn PDF document text
    • http://rilopuxam.rf.gd/93147246350.pdfIn PDF document text
    • http://lubozogemodusa.epizy.com/37630484069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb531fd-f68b-4607-ace0-0b6dfbfe5fc1/lijagunapedexoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b356ad-c443-41e8-879b-ac4ede2c5101/fojojajukoduz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804d5ce4-df2e-4cea-bc83-0d6a6253061e/puxarixawejelevexiti.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_off0000e1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D3 5296 bytes
SHA-256: 1c757fc4c2edcecf4c0d2e921d842a3f9497d06324e589c92084a7b9f224d3f1
font_01_sfnt_off0000f3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 10320 bytes
SHA-256: 0637690b5e147f6e82a1023ae4982ab9120057f5503e529294213b3f2a2dbac7

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