Malicious PDF — malware analysis report

Static analysis result for SHA-256 a176601fa95028f9…

MALICIOUS

PDF

76.6 KB Created: 2021-03-17 19:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e99a00a53d7ad515a8a51140ed934053 SHA-1: 94ddc3842019a745bf59545c531b3c26e38ba10b SHA-256: a176601fa95028f9dce396c3b26931bc798423f45599aee2188c6e8ff86e6643
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 0.9991

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://dafemum.ru/strik?utm_term=is+berserk+still+ongoing PDF link annotation
    • http://bapatavusirave.mygamesonline.org/jowodimidizigugasuxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470226/normal_5fe508e7520fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_5fdbfa179227d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_603bbd56a405c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372982/normal_600b799e2a146.pdfIn PDF document text
    • http://badoxik.scienceontheweb.net/xisevedenipep.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/68406846748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_600dbfce71e7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386073/normal_5feb057104eeb.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/gasification_of_coal.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/the_magic_school_bus_chapter_books_set.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/free_crochet_pattern_for_irish_rose_granny_square_afghan.pdfIn PDF document text
    • http://pimesizawox.sportsontheweb.net/what_is_buddhism_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413474/normal_604783f3a97ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_60504df407a42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465908/normal_6018483e07c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386084/normal_603d351407431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487647/normal_5ff77a5fc14f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480161/normal_602dd5705e49e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/lynda_cursive_bold_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/moxivujitaje.pdfIn PDF document text
    • http://punotonaduwize.atwebpages.com/litanibufokekanedog.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/fojanirudezipexezomuxovo.pdfIn PDF document text
    • http://nivuzujanux.myartsonline.com/gasinadibokewukirotekiwon.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_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 4784 bytes
SHA-256: 9db4bffb07124454a283be47fdc7e58a2861d217a38b846ec104601b3fed2031
font_01_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 11000 bytes
SHA-256: 659c8298aa7810156f9848e6e42e627c6f662c22b9bc0a42c2a4dae02f7d04d0

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