Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c3f8a465c913a1…

MALICIOUS

PDF

120.3 KB Created: 2021-03-03 12:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 84fd8abd7e1349194eb32fb57fa04080 SHA-1: e15cc3e1e91eb7505f4c35770ea792ea8ae79ece SHA-256: 78c3f8a465c913a1b2322e052a0433c550c93664ac9eeebda0d0d875c0f270de
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are commonly used to redirect users to malicious sites, potentially for further exploitation.

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://midufefew.ru/award?keyword=ff7+gold+saucer+battle+arena+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367310/normal_5fe1cdcf4bf2d.pdfIn PDF document text
    • http://websporizle4.com/467219230361coyd.pdfIn PDF document text
    • http://feedbacrnz.space/501_word_analogy_questionszcee1.pdfIn PDF document text
    • https://bofujobepoj.weebly.com/uploads/1/3/1/1/131164048/suvudedapimo.pdfIn PDF document text
    • http://avbox.org/1805191137zmu25.pdfIn PDF document text
    • http://bridgecommerce.com/vojotujexekisebebugusyx4c.pdfIn PDF document text
    • https://gawofatofuwe.weebly.com/uploads/1/3/1/3/131380275/bufoxoli.pdfIn PDF document text
    • http://zathkatow.xyz/4944914985942zkj.pdfIn PDF document text
    • http://micrometerdigital.xyz/be_here_now_book_ram_dasstdrgs.pdfIn PDF document text
    • https://pakimisubimoge.weebly.com/uploads/1/3/0/7/130776027/kumafe.pdfIn PDF document text
    • http://shoppingyxplus.xyz/10939896552yfc4h.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/learn_how_to_buy_and_sell_stock_options7s6ch.pdfIn PDF document text
    • http://siondez.ru/727984911703qpa8.pdfIn PDF document text
    • http://my-favshopf.online/11448393793pcie3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454819/normal_5fc87b3dcefe0.pdfIn PDF document text
    • https://jibizixowaxen.weebly.com/uploads/1/3/5/2/135296653/6a0051d51651.pdfIn PDF document text
    • http://nuverlites.online/zizenekefosobuxudar33er.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15386 19788 bytes
SHA-256: 1c8f72b144b8e0266dee0d968a5371465a5e090ba47bca7b99831073041f2915
font_01_sfnt_off00019278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19278 5364 bytes
SHA-256: ee958003096b26d53146cc9c2dcc4b814e72cd5d750331f88469cffc7622f779
font_02_sfnt_off0001a4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4D1 15048 bytes
SHA-256: a049d7ee02bcac60070cf372fe146bebfdb213b541a075f21e0bed50023acfca

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