Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fe4d285c22cabe…

MALICIOUS

PDF

44.3 KB Created: 2020-11-06 23:04:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: e72b0a4507f39d7b27721e3a92009eba SHA-1: 5348f1890b40879fb607f99d57852053c616d3e2 SHA-256: c8fe4d285c22cabee06cca13caf8109ea38582ae1611f0d5ea9fabb9c641d3ff
126 Risk Score

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=rac2v1s+router+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448550/normal_5fa210b186740.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/gugomevorerenak.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/7ba21785-ecf1-47f3-bf8e-2fbbaf97b3b3/unwholly_neal_shusterman.pdfIn PDF document text
    • https://wobonil.files.wordpress.com/2020/11/64447521224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40153c82-a877-4d20-af28-4d61a8d31505/leret.pdfIn PDF document text
    • https://vabavoresadi.files.wordpress.com/2020/11/debewasomogoro.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/18742048442.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/skullcandy_wireless_headphones_uproar_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/049a87c8-25ee-4298-a081-c11da0520d4a/zavir.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/csu_ag_day_2020.pdfIn PDF document text
    • https://zatejoru847961968.files.wordpress.com/2020/11/72489844693.pdfIn PDF document text
    • https://felibule.files.wordpress.com/2020/11/wanojuw.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_off00007100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7100 5196 bytes
SHA-256: 3acbe7700c194f73e969c0c2e777101c52dddb60a83bea055453b86f3b1256d0
font_01_sfnt_off000082a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82A5 9852 bytes
SHA-256: de9eed6e9f1cb0ada3051e520adb5ab514bb646e03a90bcbe99f5d37a0d24a56