Malicious PDF — malware analysis report

Static analysis result for SHA-256 759e65d199115a41…

MALICIOUS

PDF

84.2 KB Created: 2021-06-11 20:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1e6f07bb0854407a74377e3f691c1fd0 SHA-1: 2024c3edb0179fdc327c09379e405d7fd8882467 SHA-256: 759e65d199115a412a944c3e14c6d575cd5d30cd21f391fbebd9a9f268892931
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 0.9995

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://medvor.ru/pbw?utm_term=extreme+sports+reading+comprehension+pdf PDF link annotation
    • https://sidusumidiwef.weebly.com/uploads/1/3/4/3/134366372/2784870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499021/normal_5fd3bddb71181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423471/normal_5fd9a64e23c55.pdfIn PDF document text
    • https://rojogude.weebly.com/uploads/1/3/4/3/134396813/fusexanam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485329/normal_605918578b0f4.pdfIn PDF document text
    • https://zunijitulizi.weebly.com/uploads/1/3/5/3/135305500/pudanarijero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_6025cb6f95651.pdfIn PDF document text
    • https://vozexipazaxa.weebly.com/uploads/1/3/4/4/134444785/xexefiso_fixez.pdfIn PDF document text
    • https://ribafiligizeki.weebly.com/uploads/1/3/1/4/131438260/72a2bfd9f990.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404112/normal_60032b2ed4f00.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/ea3074e6-91e8-4000-a4d8-5d2678d8db5a/wejipawobuvedimige.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/can_you_download_pixelmon_on_minecraft_pe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/979a6fbc-179b-4f98-8dfb-74d0eb1f17cc/24114959709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d9d0e2-98cb-41a6-a004-713a49b45175/intangible_asset_balance_sheet_definition.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/sea_of_monsters_chapter_11_summary.pdfIn PDF document text
    • http://kivupored.pbworks.com/f/tarjetas_zea_de_cumpleaos_para_una_amiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e63fd1c0-d4c4-487b-bd55-31691b3d65c4/7954761308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d973b24-e6fe-458d-9163-046a2ce8de4d/ecuaciones_diferenciales_con_aplicaciones_de_modelado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f40d5250-24e3-4f9c-99a6-c05775125d19/clash_royale_descargar_para_pc_windows_7_gratis.pdfIn PDF document text
    • http://gisugakeg.pbworks.com/f/harry_potter_wizards_unite_hack_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca54c68-f367-4ef6-a1ba-c034b3586fb1/rowiwi.pdfIn PDF document text
    • http://safopiluzaw.pbworks.com/w/file/fetch/144757620/12776947939.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_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 5560 bytes
SHA-256: e49e92964f9555e38e371128d448b1bc5564f1d86237ceb82fd80cea0d0f28ac
font_01_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 10668 bytes
SHA-256: bbae84a43f7c75625aae3964d99583539812f584237e18fc07aca6f887b974e1