Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a51d31a0d5ec18…

MALICIOUS

PDF

71.6 KB Created: 2021-02-26 15:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 99844130ae6cafe04ea7cc8394a28e10 SHA-1: b55949fa667bf0b3a487164724d8fa89634d00dc SHA-256: c7a51d31a0d5ec182fc366a3243605884422379ba504a189b3a2f1acaa5e5908
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, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

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://botokaw.ru/wix?keyword=kirsty+hawkshaw+just+be PDF link annotation
    • http://linavaluviriv.getenjoyment.net/reality_transurfing_by_vadim_zeland_-_steps_i-v.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/mosawimorewezimekeselulo.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/matotelutedogekawofa.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/AIBihij/mcdonald_s_holiday_hours_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_602f3891b604d.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/25668974995.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/cGjgBQh/e_coli_infection_uti_contagious.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/what_is_the_newest_ps_vita.pdfIn PDF document text
    • https://cdn.sqhk.co/lajojeletab/VgfIjeL/20574680131.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/conair_portable_steamer_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/djcgijc/bedroom_furniture_sets_buy_now_pay_later.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wififeju.atwebpages.com/pivijigog.pdfIn PDF document text
    • http://jemileti.atwebpages.com/13609861507.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/79517873551.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/37419304211.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/88078713654.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/dd-wrt_repeater_mode_not_available.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/arduino_board_manager_missing.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_off0000d8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CD 5184 bytes
SHA-256: f79127d2b40c06ee157b9ba0cc3b55c7b430809b4225403e4f1cf49413e71c94
font_01_sfnt_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 11880 bytes
SHA-256: 3ca622a013ae4e8b37c9584fe7010c80275286b2b618843df1e719187e8f425b

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