Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba2a399e8f8e6c5…

MALICIOUS

PDF

80.5 KB Created: 2021-05-21 03:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d97a6a4bee58c3dd618ae74f9cb2c94 SHA-1: 9acc708c7ac5cb2049033473fd15bb101e9e510b SHA-256: 9ba2a399e8f8e6c52e6ca536d6e52abb5761bdb4dafc12c849b77be8c3286513
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the presence of embedded URIs and the overall structure suggest the document is designed to facilitate the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=printable+calendar+2021+monthly+pdf
    • https://nelinijamewugin.weebly.com/uploads/1/3/1/0/131070382/3137853.pdf
    • https://rejurikin.weebly.com/uploads/1/3/1/0/131070637/850668.pdf
    • https://cdn-cms.f-static.net/uploads/4473379/normal_5fd64bcbb37d7.pdf
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/kiteza.pdf
    • https://cdn-cms.f-static.net/uploads/4408180/normal_605ac83049e65.pdf
    • https://cdn-cms.f-static.net/uploads/4387919/normal_6054f8ad9fc46.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/297414e1-c19d-4e60-b974-974484afa997/vadalibenasizemuxizeroje.pdf
    • https://s3.amazonaws.com/patotale/best_good_night_wishes_quotes.pdf
    • https://s3.amazonaws.com/lusegokaves/insulated_concrete_forms_house_cost.pdf
    • https://s3.amazonaws.com/vetamedisoz/asimo_robot_information.pdf
    • https://uploads.strikinglycdn.com/files/15c57503-b544-4f71-847d-83bdf9bae651/brown_bear_brown_bear_what_do_you_see_story_powerpoint.pdf
    • https://uploads.strikinglycdn.com/files/c95968e7-6e3e-4cd8-89c2-a8bb666c90d7/wakoradefarumigawogokijim.pdf
    • https://s3.amazonaws.com/nawuvud/bupaxewudixutivutironos.pdf
    • https://s3.amazonaws.com/bikikanafopavu/animation_desk_for_windows_10_free.pdf
    • https://uploads.strikinglycdn.com/files/f9e37265-d813-4337-974b-efd38bd1916c/list_of_sdg_targets_and_indicators.pdf
    • https://s3.amazonaws.com/legapatatezisa/punifoziraxumadofipowa.pdf
    • https://s3.amazonaws.com/nemafu/3034063557.pdf
    • https://s3.amazonaws.com/dezajok/averta_std_font_family_free.pdf
    • https://s3.amazonaws.com/xoferuzu/quantitative_research_proposal_example_apa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc31.bin
e3a4c53b12aaefc10ed047bea77ca9c8381cc27647d65d57dbbf44f0aaacae2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC31 5788 bytes
font_01_sfnt_off00010fc1.bin
5b17f284850f664722425cdf33b118a946c8ed6158d0908f0473ddb58bf49de8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC1 10868 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.