Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92ed31d95e89186…

MALICIOUS

PDF

73.5 KB Created: 2021-03-28 07:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f805fd9fa8dbf674bda6ce6b1108cbc1 SHA-1: dc0437f394c220ec62d9a3f5b1bf6d2144003b4f SHA-256: d92ed31d95e89186b4e04bd073024e54849038ced476d3ed528be4e4b01d0cd6
156 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-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.
  • 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://resalured.ru/wix?keyword=estilos+de+aprendizaje+de+gardner+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500897/normal_6056397e6e3fe.pdfIn PDF document text
    • https://pusazaninad.weebly.com/uploads/1/3/4/3/134358808/7a9927c.pdfIn PDF document text
    • https://raromimuzu.weebly.com/uploads/1/3/0/8/130874361/wamutowuzo_wamejomeko_lisawowufaxol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417221/normal_5ff0086187e7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444657/normal_5fdc21e5205a5.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/ibF2hb9/65962302481.pdfIn PDF document text
    • https://cdn.sqhk.co/kepozote/Z1Ghahd/80_s_90_s_music_online_radio.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421468/normal_5fde8fdfdf75f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494677/normal_605470543b22b.pdfIn PDF document text
    • https://lefawiput.weebly.com/uploads/1/3/5/3/135324435/ruwuve_kikaredosu_wekajobuvafox_xukarovorizozod.pdfIn PDF document text
    • https://cdn.sqhk.co/mofisozulud/gOhfjh1/pokemon_tcg_online_trade_code.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/nBeBvqS/finototinodi.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/2ac962d6-877c-4f05-924a-e7dd4e96e610/italian_modal_verbs_imperfect.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51ac6475-43e1-4028-94dc-d3ebe0481175/vakamasoxizuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88da01af-c01e-44dd-bfa6-34098769c2ce/how_to_change_light_bulb_in_ge_monogram_refrigerator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a74f9a-67f6-42b8-a7ee-d069da53c3f6/gopro_hero7_silver_4k_action_cam_battery_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb227923-a04f-44d0-a035-bd8fbec329dc/wusulagababexunusobuvasap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4835ceac-6155-4aee-ba8d-ed7cc9c51b7f/23580303281.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_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 5292 bytes
SHA-256: 2732d2c30eb48261885377b361ce97c7df429db7a270fbb4571a7d17598005bd
font_01_sfnt_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 10684 bytes
SHA-256: f10927152dc9724d0e8566f315d7ce63118f0ddab468af958fcdcc099504eb40

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