Malicious PDF — malware analysis report

Static analysis result for SHA-256 d331ebe29b0d6542…

MALICIOUS

PDF

79.2 KB Created: 2021-03-24 14:38:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 18c76b2c33388c0998c6b44e15e4d224 SHA-1: 91ed61eb065243ed14325f565c7f8f32d0deefd9 SHA-256: d331ebe29b0d6542d099de14e3999d2a68cd56bc1b510ddae90ef22516df8558
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://nipisod.ru/wix?keyword=relieving+letter+request PDF link annotation
    • https://cdn.sqhk.co/zolewiko/bXYYve0/41812082390.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/EA5jcgi/cyber_crime_notes_for_llb.pdfIn PDF document text
    • http://onlyforyou.space/what_to_cook_for_indian_dinner_partywsifr.pdfIn PDF document text
    • https://vanevuzitikuge.weebly.com/uploads/1/3/4/5/134588875/e3c480f4601a.pdfIn PDF document text
    • http://faceit.su/lugosumutosakodatheoab.pdfIn PDF document text
    • http://casserlabs.xyz/how_to_pair_bluetooth_headset_with_pc_windows_10qsl6w.pdfIn PDF document text
    • https://kitivagep.weebly.com/uploads/1/3/0/7/130775950/babokogufo.pdfIn PDF document text
    • https://cdn.sqhk.co/fetesulatol/dd3gqjb/alpha_helix_and_beta_pleated_sheet_differences.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/Nsp0uig/max_payne_mobile_v1_7_mod_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_5fe7214ea26e7.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/SoDjdQY/95114432404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421764/normal_602e06342d8ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_f635ea9c2e07420a928d8b36db0ca2c4.pdf?index=trueIn PDF document text
    • https://74df6fe0-557b-4e47-8461-f2df536053d0.filesusr.com/ugd/4dcf4e_12e5dbcaa1cc4dd5accd419874dd5e8f.pdf?index=trueIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_02a7c041dbaf445daf0e9860e88e1a67.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_3fef8319115c4b4da1192ceebd8da543.pdf?index=trueIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_f6ef9f4325c042e1bcd085d4416251db.pdf?index=trueIn 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_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 4836 bytes
SHA-256: 60be3ef2658df92f0665e75a893d4438d08d46f19023de55c0e7f06c8d65fe5e
font_01_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 11216 bytes
SHA-256: 579d8cfbdebf4598fe765aaccf5b1533d60a6990b36552474d1e8275645bdaa0
font_02_sfnt_off00012027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12027 3652 bytes
SHA-256: 479ad1f7d4f806894d74b1e350505065ab02e5615784aabdd83b124c28c43cc4

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