Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9a7ca12cb936a8…

MALICIOUS

PDF

82.4 KB Created: 2021-03-28 12:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 355a6e57e8c2f9463f91f2dc5d60fd2f SHA-1: 419b0023af9dee2880f61249083bed21953488ab SHA-256: 1c9a7ca12cb936a805ebe4b4201d6d70c4514837c7a9399d117c480f1817baeb
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were extracted, the presence of numerous external URLs, including one with a suspicious domain (ponafet.ru), points towards a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/award?keyword=cantares+mexicanos+nahuatl+pdf PDF link annotation
    • https://xapowukugo.weebly.com/uploads/1/3/4/7/134702937/miwudatutetidabazaze.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/f5hcihI/shogun_bistro_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CqLhfN7/localizar_mi_android_por_gps.pdfIn PDF document text
    • https://bibutijelogoper.weebly.com/uploads/1/3/2/7/132740620/najisatirul.pdfIn PDF document text
    • http://pumutug.iblogger.org/29036057990.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/iVjaUhb/86740710357.pdfIn PDF document text
    • https://lisokafi.weebly.com/uploads/1/3/4/6/134694643/c75dfad.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/gh8D2gi/bagowekixamigojodobivoji.pdfIn PDF document text
    • http://fanitukasi.22web.org/elf_on_the_shelf_colouring_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/xunalafugapa/jcOreVF/dajojifazovanowi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zazufazujinuzo.rf.gd/wodijowekogududukopekawe.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/54571188673.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/holding_company_accounts_format.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/fimalovorekoxif.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/wd_my_cloud_ex4100_ip_address.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/suddenly_seymour_flute_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/mekexonusinokojufimunepum.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/crear_sopa_de_letras_online_gratis_para_imprimir.pdfIn PDF document text
    • http://tonubugiloroluv.rf.gd/ansi_c_programming_language_download.pdfIn PDF document text
    • http://mekavebij.epizy.com/potion_brewing_minecraft_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/faketox.pdfIn PDF document text
    • http://vegexiwijije.rf.gd/13099192789.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_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 5368 bytes
SHA-256: ea035a697c4b4efa0a45f8aafe33c90c897f63f34b06e702a47418985f268fa2
font_01_sfnt_off00011535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11535 11992 bytes
SHA-256: f6733ee351ac98fb79a58e673e77b2544781ddc47baa40780a2859b8ac9dc86c

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