Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed78b4fcf635423…

MALICIOUS

PDF

94.8 KB Created: 2021-06-04 10:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3618f752273ff0438699329f5cf8890d SHA-1: 533d79a0be268b969192d624490aca8f75eb080d SHA-256: 8ed78b4fcf635423d7a1b94e6daba40ec7e6d1063b4b8ab85e1e932c4c611039
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or hosting malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://laborke.ru/pbw?utm_term=when+did+bc+end+and+ad+start PDF link annotation
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/motejonu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496378/normal_6026c081e0747.pdfIn PDF document text
    • https://vujexuxifu.weebly.com/uploads/1/3/0/7/130739824/rotulorobigebude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408324/normal_605534252945c.pdfIn PDF document text
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/buden.pdfIn PDF document text
    • https://zatikavetix.weebly.com/uploads/1/3/2/3/132303242/bameseweluv_zexatuju_fotun.pdfIn PDF document text
    • https://jirorenuges.weebly.com/uploads/1/3/0/8/130874518/liguvedalizu-papesu.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/2b637e3b-5477-4f25-82c4-6fc7fcd600a4/xexizavedoxoduna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3944680-e91a-403e-90d6-633c7e84cd62/98611879819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/188abe1d-3e78-4359-a09c-a40a39abb68a/81628032333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c17c3f-e019-49c4-8914-9e996182cdd1/xuxitimiwutupazowo.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/f/avantapure_water_softener_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb92e72f-9b0e-4d90-a6cf-7bca5419154c/zmodo_camera_setup_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e735e5f7-0686-4b6f-9390-5920c6adb944/tabigatobafedew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f755f0-7dd5-4905-b3c9-c1a38957eb62/do_all_diaper_genie_refills_fit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39fab9fc-1e3f-4598-accd-81fea13e2117/branchville_correctional_facility_visitation_application.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18395040-2833-4eeb-aaca-9f3a36d90921/xabilojupegipa.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/w/file/fetch/144565653/17393186894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef11dce5-52a1-43bb-a6fb-4f9a377a86a8/english_101_course.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001264e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264E 3456 bytes
SHA-256: 3b3d5a96114aebde74d2901d22061ad0d209f21532e0f68b9c1b12d090970b1a
font_01_sfnt_off000132a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A5 5148 bytes
SHA-256: 083aa5c7fd0755cf757c4bae7f7a05d7f515e05d8435e0f1a109371055f2cb5e
font_02_sfnt_off00014425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14425 12508 bytes
SHA-256: caae16b1c7cbed4e8630dd9206c415f45c899c65879dd8fb4c73d9fefee571b2