Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc7cb6182c3e70f…

MALICIOUS

PDF

52.9 KB Created: 2020-11-09 05:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a7bfd51ae66c75aa5c684efd6675affa SHA-1: 9b9648efab5f8bb3d88eb808f258635b57ef472f SHA-256: 9dc7cb6182c3e70f505f634e7a9a31d206ab8035fa402e8dccfc7691a0285603
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 1.0000

Heuristics 5

  • 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://trafficel.ru/123?keyword=assistir+filme+online+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453334/normal_5f9fd94b90184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448110/normal_5fa7aedc8fbda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469143/normal_5fa6725265dde.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/e618fce96498c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_5f9e27d02ff8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_5f9a3a7349b95.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
    • https://paduduruvaz.files.wordpress.com/2020/11/vavimebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb536e4-242b-419f-b29b-61e9578e80f1/westing_game_book.pdfIn PDF document text
    • https://dexizow.files.wordpress.com/2020/11/harry_potter_y_la_camara_secreta_audiolibro_carlos_ponce.pdfIn PDF document text
    • https://nulapizovo.files.wordpress.com/2020/11/36585500424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f36c809-606c-4996-9c5a-8d42ea9c4010/pelican_bass_raider_10e_boats_for_sale.pdfIn PDF document text
    • https://pufelaneniw.files.wordpress.com/2020/11/35867518064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c14b75bf-f294-4c21-a9d5-cd3a61bfe8ee/how_to_prepare_soursop_tea.pdfIn PDF document text
    • https://dabadebidu.files.wordpress.com/2020/11/kofulijokakenujewulewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149fb149-e1e5-40b1-b501-f211759abec3/kalikujefuxuliwulef.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_off00008484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8484 4612 bytes
SHA-256: edb5c29f66f4f4d0c92c45bd5bd43d629c6d22f6410ae767bd29a5fd43b49957
font_01_sfnt_off0000940a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x940A 11316 bytes
SHA-256: da0899a2b4acfc1ba83d24e0f47ce2e5e9011aaf9b52b94fd08ca5d411ffa476
font_02_sfnt_off0000b88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88E 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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