Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a936ab84630b72…

MALICIOUS

PDF

76.0 KB Created: 2021-03-21 23:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 56ea53be1452c25b2af755c5bb09a158 SHA-1: e5b9f2ceaf4cbb7772e691c988562068ad50e2c5 SHA-256: 25a936ab84630b725a51170ad8cad931b16842852699a1966c5a83c306f81b55
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary URLs, 'https://soxebez.ru/award?keyword=africa+history+pdf', is suspicious and likely part of a phishing or traffic-driving scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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://soxebez.ru/award?keyword=africa+history+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475219/normal_6018326da1f93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_603ea9f386ad8.pdfIn PDF document text
    • http://lewodozena.22web.org/homographs_worksheet_for_grade_3.pdfIn PDF document text
    • https://fagadixiridare.weebly.com/uploads/1/3/5/3/135304990/bugakubotovewid.pdfIn PDF document text
    • https://gupoxebexu.weebly.com/uploads/1/3/4/3/134337811/mevemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_6054bd90f0163.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374979/normal_5fce4eeb741b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379491/normal_5fd7a7895793b.pdfIn PDF document text
    • https://mizemajawoxulu.weebly.com/uploads/1/3/1/4/131437858/bivarupetot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/gajufobaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/anaconda_tamil_movie_part_2.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/64732407465.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/kejon.pdfIn PDF document text
    • http://limirosu.rf.gd/ruzuwexeledisijupus.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/excelsior_springs_missouri_post_office.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/user_acceptance_testing_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/4431290337.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/chrome_extensions_android_ublock.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_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 5300 bytes
SHA-256: 7856a2f48a7ef34be0290eeb47aba90533ebf380037753f3d085e8014115b743
font_01_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 11148 bytes
SHA-256: 0016ddd34a26aacef0b364aff954132bafc74120a1f8efdec5c005a0efdfda4c

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