Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4cc3be89121bde…

MALICIOUS

PDF

77.6 KB Created: 2021-06-08 04:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fcd29327bdf71d7df4bc2245128b2ba7 SHA-1: 11b5fe0c9ddd0d8dc3cd2b8d819c0c7224484397 SHA-256: 8b4cc3be89121bde8393b21170808626be5a2a6d52cf50bf71f5d4aec6cec67d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/123?utm_term=emploi+alternance+informatique+toulouse PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4369496/normal_60b1f36e9d1ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481828/normal_5fe66b50b9967.pdfIn PDF document text
    • https://wasexakenisopi.weebly.com/uploads/1/3/5/9/135982815/3521160.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/duligo-rewobi-kiwiketizowe-xilexavo.pdfIn PDF document text
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/kidokadonu.pdfIn PDF document text
    • https://zegadakupoxak.weebly.com/uploads/1/3/4/7/134749069/9788797.pdfIn PDF document text
    • https://nevidabaxava.weebly.com/uploads/1/3/0/7/130775666/b0b505bdb44af8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404966/normal_602c373fbcdcb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nafakogoxu.pbworks.com/f/what_does_the_doomsday_clock_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9bfdc72-88e0-4b9c-8128-89454c34640e/dabijakegixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2379184-62b9-4c8a-8aa4-2f31528b7a4b/asp.net_mvc_5_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a6497c-97ee-44ce-a01c-1dd0033a8f82/vokazozuzabivakino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3abf9d83-45fa-4cc8-ae66-2c989d658ef7/what_are_the_general_questions_for_an_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2d7e14d-1f39-40bd-a3c1-3a23fa040a3e/how_do_i_install_netflix_apk_on_android.pdfIn PDF document text
    • http://lovixov.pbworks.com/f/voposefetes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7bec44b-5d73-4706-9c45-f75944939272/6785078851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d525db-9c32-4f07-8cb0-e2eecb754746/doboso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c9ad74b-c270-4b0c-bb82-c13fd84db134/93964489742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6740da89-7969-41e0-b1c1-451af75f2203/95240910682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb19a9be-88bd-4dbc-96d0-a81711851660/how_to_get_rid_of_spaghetti_worms_in_aquarium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb743c5-cb9f-4271-ad00-de515b0053b7/lonakad.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_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 5128 bytes
SHA-256: 7a69409df36e3b9a41c65d5cb669d48312bfd6327d90e01b64241a8576f74116
font_01_sfnt_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 12492 bytes
SHA-256: e6d3d478edf3e9227087f465506b185ba9d777909a64b9ad0546993f342b4c39
font_02_sfnt_off0001195f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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