Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6b3d9b1ad8c758…

MALICIOUS

PDF

70.6 KB Created: 2021-04-23 00:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c8586fa4c076e9298504dd05a8c46df5 SHA-1: 2822a90b36db9d0802f5bd66d0b053c4863e791f SHA-256: 8e6b3d9b1ad8c75819dd31507a146ac66ed6c041d0c0f927e5ba554e92a9ae51
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the primary attack pattern involves redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://lozipotod.ru/strik?utm_term=acsm+resources+for+the+personal+trainer+5th+edition+citation PDF link annotation
    • http://katipef.medianewsonline.com/pamebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408177/normal_6064618edac17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375509/normal_600ce2cbb5f59.pdfIn PDF document text
    • http://rujisuki.mygamesonline.org/holy_bible_king_james_download.pdfIn PDF document text
    • http://xapiduxirob.mywebcommunity.org/ensayo_del_libro_aura.pdfIn PDF document text
    • http://zaparipajomigi.scienceontheweb.net/instrumentation_and_control_engineering_books_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_6024b2ec30c74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5fcaabaadd891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464869/normal_5fd33c7fcdb6f.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/debefejowedivavofefex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_6024ee6cac285.pdfIn PDF document text
    • http://dakekunagefasak.sportsontheweb.net/xetewumajanawudeji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_60548215832e3.pdfIn PDF document text
    • http://rujewazaxijaza.sportsontheweb.net/difference_between_horizontal_and_vertical_milling_machine.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/a3f2c657-9b49-4751-8aa5-9a7a853b1509/how_to_estimate_mean_from_grouped_frequency_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/087a8a61-b1d6-46cb-afe2-a6bbf22f5196/wuwizifibuvesiwinadujiriz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8567b951-0309-4df5-ab7c-54c788365941/hatchet_book_by_gary_paulsen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1da70cd-6c65-48d5-bf22-7d4c5c0d505b/xakowanifoxam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f0948d7-9737-413b-b252-d9e38c797938/nvcc_faculty_email.pdfIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_76172db5b451476291b65cec7e40ee7b.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_3493ae55b6f34257ae90065bff33639f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D9 5508 bytes
SHA-256: 573844a42b7593d2183a55ba82c4e474a99c442e27cc70eede2a257d08482b13
font_01_sfnt_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 10148 bytes
SHA-256: dfe3456e16394a693b070d92900ff45e4d6d6986d5b4c2ce885a585d825295ae