Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd49bf0af1b8dbb…

MALICIOUS

PDF

71.1 KB Created: 2021-06-10 16:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dabae64fc784aab290ed6714d8e862e4 SHA-1: e9d8d78fdcf007c42b8d8bab46b05e11411a6e37 SHA-256: 1bd49bf0af1b8dbbf16e11d5431966cbbd7583e396cdb55cc3991856a9529a83
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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://inwebjor.ru/pbw?utm_term=how+much+is+my+bond+worth+at+final+maturity PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408587/normal_5fe3c2cfeba6f.pdfIn PDF document text
    • https://ladulokepalixu.weebly.com/uploads/1/3/4/8/134878898/63fb5.pdfIn PDF document text
    • https://tepupareta.weebly.com/uploads/1/3/0/8/130814680/468b052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_601d6d6e5a911.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/4161015.pdfIn PDF document text
    • https://melokiziw.weebly.com/uploads/1/3/4/6/134669089/ruvadufibakexer-vewumu-vosoliv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480155/normal_5feb0d1fdd066.pdfIn PDF document text
    • https://nuvipepive.weebly.com/uploads/1/3/1/4/131409498/vukutab.pdfIn PDF document text
    • https://zigizawinowola.weebly.com/uploads/1/3/4/4/134457077/c8cfde919.pdfIn PDF document text
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/forupaxuromagoji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gitixofipoxu.pbworks.com/f/22978188423.pdfIn PDF document text
    • http://wirajudukim.pbworks.com/f/48928329406.pdfIn PDF document text
    • http://kekirow.pbworks.com/f/tense_chart_english.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/sniper_assassin_3d_mod_apk_ios.pdfIn PDF document text
    • http://jinotofatum.pbworks.com/f/starbound_legendary_weapons_list.pdfIn PDF document text
    • http://magobok.pbworks.com/w/file/fetch/144783765/how_to_cheat_on_edgenuity_exam.pdfIn PDF document text
    • http://zegakodas.pbworks.com/f/14521956125.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/w/file/fetch/144510303/lista_de_verbos_adjetivos_y_adverbios_en_ingles.pdfIn PDF document text
    • http://wiliser.pbworks.com/w/file/fetch/144623643/find_the_missing_addend_3rd_grade.pdfIn PDF document text
    • http://kivotin.pbworks.com/f/fefirebizevumawolikami.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_off0000d974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 5556 bytes
SHA-256: e8f368293c355b0391dba9303fb2e75fe05cb4ffae35e967a905667fce74f8c5
font_01_sfnt_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 10240 bytes
SHA-256: a44427be8c83bcc86060bf85c4bd42ed366708f5974d707c7219c10b3f4b0a0b

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