Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ffc87354c279cd…

MALICIOUS

PDF

74.1 KB Created: 2021-05-13 06:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d1179eb0f558108b1ade89caf5028641 SHA-1: 5114fe3a58dea538d20f358730213c041cf6df8f SHA-256: 40ffc87354c279cd87f0c541144248bc2b2aff2f7d0bb4644ffc4b9caddd8a33
186 Risk Score

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 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/strik?utm_term=how+to+do+arabic+calligraphy PDF link annotation
    • https://cdn.sqhk.co/gidulikegel/f6gdhh3/colorful_fluids_live_wallpaper_android.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/e3AzFia/real_piano_teacher_game_download.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/8868715901662d3x.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/ibf2geS/ultimate_fall_guys_servers.pdfIn PDF document text
    • https://cdn.sqhk.co/ninilevikod/jif0iib/red_ball_game.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/vPvJhhM/67898757212.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/ihhQjcV/gatepazuj.pdfIn PDF document text
    • http://teachost.com/mufepesevusodusu922t3.pdfIn PDF document text
    • https://mazefitarunakur.weebly.com/uploads/1/3/1/4/131453858/somebetu.pdfIn PDF document text
    • https://supagerafigi.weebly.com/uploads/1/3/0/8/130874211/nirinasetu_gakawofibofo_mimizida.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://xubatazu.22web.org/53806557937.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/e0ggGxW/238619936.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/gXhi2l2/free_music_download_for_iphone_11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_e610ca1e25f7401089f99e8cd2e98806.pdf?index=trueIn PDF document text
    • http://gopudagob.epizy.com/xamixatew.pdfIn PDF document text
    • http://denonewozififuz.rf.gd/circular_dependency_detected_on_resource_azure_template.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_6b159abe69154db9bf25bfaa58474284.pdf?index=trueIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_ce48f8031ac64a79b222561e8a4f0e1d.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_4e596250857c47bf9a5f8c0162f4fbc7.pdf?index=trueIn PDF document text
    • http://lejuwugumiwa.epizy.com/english_comprehension_worksheets_for_grade_5.pdfIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_411dc73a187d46a2b6c5786f9426d51a.pdf?index=trueIn PDF document text
    • http://tijemimujajig.rf.gd/xilamitegojil.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_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 5452 bytes
SHA-256: 78ae919c8c2988cfaf694cf62aed4199d89a70b74200a3b6062463780b9ef75c
font_01_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 10820 bytes
SHA-256: af54291ca54d2b58d6abb41d68c8cde71a9e80db2ea66dc5faf3b6917ad11192