Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93cee474785d219…

MALICIOUS

PDF

68.3 KB Created: 2021-03-30 23:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59abf4e5e2ae9a5b5815fdcd0decfa74 SHA-1: 5a8ba56e96555b2ba04c69895beefa389e3c62f6 SHA-256: b93cee474785d2192d67beb00995c2d8850ef2d0d01c4c2b2e8975ca616309c5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or content-luring tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and external links are indicative of a malicious document designed to redirect users to potentially harmful websites.

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://nipisod.ru/award?keyword=arterial+blood+gas+journal+pdf
    • http://fodelogutejamit.getenjoyment.net/jonupib.pdf
    • http://xojanefod.mygamesonline.org/al_quran_30_juz.pdf
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/2394621.pdf
    • http://xujaxul.mywebcommunity.org/best_markup_app_mac.pdf
    • http://vutunema.mypressonline.com/xerosojamosuzixir.pdf
    • http://suraneb.scienceontheweb.net/batipaxawuraxa.pdf
    • http://dawexefif.getenjoyment.net/verbos_irregulares_en_ingles_con_significado_en_espaol_y_pronunciacion.pdf
    • https://nanupubixo.weebly.com/uploads/1/3/0/9/130969545/5621832.pdf
    • https://cdn-cms.f-static.net/uploads/4421611/normal_6029e94f4d6dd.pdf
    • https://cdn-cms.f-static.net/uploads/4450043/normal_60541748ed547.pdf
    • https://cdn-cms.f-static.net/uploads/4494877/normal_5fe81eecc229c.pdf
    • https://kiwitelovig.weebly.com/uploads/1/3/4/3/134358902/fitebinojovev-wivesarumokik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/megodipewukitoj/ca_form_568_instructions_2014.pdf
    • https://s3.amazonaws.com/mujesogi/des_moines_police_department_file_a_report.pdf
    • http://guwaxilajoxeza.onlinewebshop.net/30436471726.pdf
    • https://s3.amazonaws.com/numegubowalonan/gawaw.pdf
    • https://s3.amazonaws.com/geradi/gidibidabotidaro.pdf
    • https://s3.amazonaws.com/bokexizometun/ruwejajerekewo.pdf
    • https://s3.amazonaws.com/vebisop/merriam_webster_vocabulary_builder_audio.pdf
    • https://s3.amazonaws.com/fogibi/pizasodile.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_off0000cd7e.bin
0efa94d27986eb3e99b9207d6affadcbf9593a7254166e5715aca64958b4d71e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7E 5416 bytes
font_01_sfnt_off0000dff3.bin
732225aa9c556e0d8ff5f02f77baefbb35d6ca8369354c285cdd2752b17d34da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 10676 bytes

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