Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1bdd301da51bc6…

MALICIOUS

PDF

74.2 KB Created: 2021-04-08 07:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 87a847089063b5a802b8799470443136 SHA-1: ccd71e47adf01589627da60bd6c214dabc79bfaf SHA-256: 6f1bdd301da51bc6a1a1092d5188f356cd99b2bfb53d6dbed3e75a6909e67dd6
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 0.9997

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://zajinet.ru/strik?utm_term=platicas+prebautismales+en+guadalajara PDF link annotation
    • http://sikazigazes.mypressonline.com/rumigi.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/43454170837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_6059684a7dfad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480187/normal_5fff06e4e08ec.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/91158306542.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/dNijhbi/raiden_legacy_pc_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/lenubire/Rhf286l/50619691916.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/hijco9k/dovikunasal.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/Fhc93hc/prakash_defence_academy_haldwani_contact_number.pdfIn PDF document text
    • https://cdn.sqhk.co/bepigulusibe/iBhghjp/wobiberiwubos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373511/normal_5ff7b0496446c.pdfIn PDF document text
    • http://scarcebook.com/869344583645lxua.pdfIn PDF document text
    • http://befigter.xyz/picture_books_to_read_aloud_to_4th_gradersmn0wn.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/jjicp3n/65618375101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_5fd1d7490e17a.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/31500271288.pdfIn PDF document text
    • https://cdn.sqhk.co/tolononof/gubjcMo/55518230447.pdfIn PDF document text
    • https://cdn.sqhk.co/totuzilexif/ehchjYv/65959299856.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/269d4253-0469-41a0-b418-edb43d548a57/how_to_solve_a_2x2_rubiks_cube_step_by_step_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc8b8988-399a-4b9e-9080-b5f7cbd7ff91/sony_mdr-rf985r_wireless_headphones.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_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 5608 bytes
SHA-256: f32b77f59f1b1d08e6aac50cb1d0a2cfb9746658389bd3d37374e33f47fe1c0d
font_01_sfnt_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 11836 bytes
SHA-256: 09ab568403f68de8cca056dc56694f26de38c219f3b0df3f98365ea6c65c8bc4

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