Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b803ddb5e046db…

MALICIOUS

PDF

110.7 KB Created: 2021-02-26 15:11:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 718238a91345312ecfcfa60f492ccfc1 SHA-1: 10a30dcec4bf5efbfbfa5771b3fedaab2f346c65 SHA-256: c6b803ddb5e046dbf1c97da248ab44ffceedaac9da4683e184ef6e13c4969242
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for SEO manipulation or distributing malware. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the embedded links. While no scripts were directly extracted, the structure and embedded URIs suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://resalured.ru/aws?utm_term=rm+vs+rmm PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470689/normal_5fec28b9e63b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462339/normal_5fe133175d3e8.pdfIn PDF document text
    • http://mozovurezet.iblogger.org/how_to_sample_garageband_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/cfii6hH/3438334558.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/IrGRjdV/wallis_tops_jumpers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5fd307122a87c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366652/normal_5ffa16ad31d1b.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/covid_19_testing_in_my_area_free.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/what_are_the_symptoms_of_a_bad_injector_pump.pdfIn PDF document text
    • https://taleputara.weebly.com/uploads/1/3/4/3/134305900/1421219.pdfIn PDF document text
    • https://cdn.sqhk.co/bewiviki/nFjjlgd/59397167634.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/Rhggjz2/guide_for_ff7_remake.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/wigifij/vagirikavodumijivitewadux.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/63590368685.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugavatakavupo.rf.gd/89532976166.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/calories_in_dunkin_mocha_swirl_pump.pdfIn PDF document text
    • http://romezegipoxo.epizy.com/67816429615.pdfIn PDF document text
    • http://degefoxovovi.epizy.com/84177086789.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_off000178dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178DC 4656 bytes
SHA-256: afba433767b58c2d1d7254eb711c3bb6f9f5666cdc3b3f19d637b27e4d95af4f
font_01_sfnt_off000188a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188A3 10832 bytes
SHA-256: eeda37040b452913efe0aac97cee78150771ba6e6334e46d5b0c3c6e41c258a1

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