Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc341a954f77cc73…

MALICIOUS

PDF

66.7 KB Created: 2021-03-11 22:14:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 031cc6d41eea57612c1ac62e5acfd677 SHA-1: 21b91c7767623e4f061c7922e58217a7ece7be43 SHA-256: dc341a954f77cc73fb23b46a1cd3eff73cfcdcaf2af941fcc021b92830b09d1a
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 0.9998

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://baarspo.ru/award?keyword=corporations+act+2020+pdf+download PDF link annotation
    • http://pubafagare.22web.org/how_to_connect_xfinity_wifi_to_element_tv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383925/normal_5ffb9e76c9a18.pdfIn PDF document text
    • https://cdn.sqhk.co/liwifetil/jhdgiHp/a_tag_knight_mod_apk_new_version.pdfIn PDF document text
    • http://reduslim-official.website/kalaripayattu_books6frnd.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/FkhgQhj/nibesewaxif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465941/normal_60290d45c6346.pdfIn PDF document text
    • https://cdn.sqhk.co/modesinilofe/xdihhil/farm_heroes_super_saga_download_free.pdfIn PDF document text
    • http://basvuruizleme.online/leccion_13_de_escuela_sabatica_en_power_pointxdhiw.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/9yjajj9/plex_windows_server_2019.pdfIn PDF document text
    • http://malitaludim.iblogger.org/2190115835.pdfIn PDF document text
    • http://prizinsta.info/how_to_edit_a_gif_file_in_gimpbajcm.pdfIn PDF document text
    • http://gakmancreatures.ru/445315882088ech1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulepuvasa.rf.gd/vexivokilanomijisasa.pdfIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_8d1959f024944195a05bf1b915bd5325.pdf?index=trueIn PDF document text
    • http://naxaroxabim.rf.gd/82907731617.pdfIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_409ec7904fda483f9f39840a494d4235.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/grave_disease_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/witevon.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_5b4432d660d0451c84dda311c0a22a16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebisop/romijotiraxasadaposumila.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_off0000c984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC984 5420 bytes
SHA-256: 42aff25965d417f4fe4fea1835e90567915e8221145cecefb093fb0671f6483e
font_01_sfnt_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 9840 bytes
SHA-256: 64480e1cb9271c467e6a313139a085bb21a0557fb3ecb4d8d35dbb93eea139a5

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