Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad1e0f5e96115e6…

MALICIOUS

PDF

101.9 KB Created: 2021-02-15 08:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b0a2065c9978533877489c132d7aa53a SHA-1: e37316d11091630a8fa863c8cb8da049c7f0e16d SHA-256: fad1e0f5e96115e677fd843db6e94c79af2cd0adadf76f2d441f37f8998a01c9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit users via malicious links.

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://jacksth.ru/wix?keyword=1491+pdf+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/folukize/ixgiLhX/squirrel_bomb_drink.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/hKRhdVz/limomefuragepupepesaza.pdfIn PDF document text
    • http://wutomomar.22web.org/48964603324.pdfIn PDF document text
    • https://xogofodaromaf.weebly.com/uploads/1/3/4/3/134387758/novurojinakomabipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388432/normal_60253ab819eb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500183/normal_5fe515043156d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404955/normal_6026fb5607f66.pdfIn PDF document text
    • https://rufeguduti.weebly.com/uploads/1/3/1/3/131384240/8613592.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/ges5F1h/the_wolfman_full_movie_watch_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410730/normal_5ffa1075a16d6.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/Y5Ghaic/50245117332.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rusakarazixano.epizy.com/akalamagbo_free_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/beyblade_burst_hack_apk_5._2.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/brave_web_browser_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/single_member_llc_operating_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/attestation_form_for_csir_net.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_off000152d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D5 5352 bytes
SHA-256: 08439fbcf229fb402128262ada7612fb38ed7775594baaca808cd5adea1f4f26
font_01_sfnt_off000164e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E7 10692 bytes
SHA-256: 403039ccda5f8441a39f41006d12b3b6178984b5b384d20ca2387ed91b609394

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