Malicious PDF — malware analysis report

Static analysis result for SHA-256 659089723d789ea2…

MALICIOUS

PDF

79.8 KB Created: 2021-06-12 21:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2340074027efd685c0c5e0c34abf7f6 SHA-1: 7bede9d2e0536c6e17cd73a7a77d09ddc17d0541 SHA-256: 659089723d789ea2227e2fb5e11e308b99dd805a9c4c2c6c992b42fe508eae39
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 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to redirect users to potentially malicious websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URIs indicates a likely intent to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/pbw?utm_term=sport+car+3d+model
    • https://cdn-cms.f-static.net/uploads/4466146/normal_60247fa1dabe0.pdf
    • https://cdn-cms.f-static.net/uploads/4389603/normal_5fda854b12cbc.pdf
    • https://cdn-cms.f-static.net/uploads/4460247/normal_603821f1cddd3.pdf
    • https://lisoletabe.weebly.com/uploads/1/3/4/5/134511207/lewipizaror.pdf
    • https://cdn-cms.f-static.net/uploads/4470979/normal_601fdf9754672.pdf
    • https://kisofoga.weebly.com/uploads/1/3/1/3/131383553/6f1c2a3e5e02325.pdf
    • https://suzupiba.weebly.com/uploads/1/3/4/5/134507321/7701566.pdf
    • https://cdn-cms.f-static.net/uploads/4389603/normal_605f0c9052641.pdf
    • https://cdn-cms.f-static.net/uploads/4417045/normal_5fda4031a2038.pdf
    • https://gozajajemitala.weebly.com/uploads/1/3/4/3/134325553/mimofabapupiz_nesido_fazuzofapesu.pdf
    • https://cdn-cms.f-static.net/uploads/4476601/normal_6061f7ea5361e.pdf
    • https://cdn-cms.f-static.net/uploads/4416666/normal_602596e490ac3.pdf
    • https://duzikasaropofe.weebly.com/uploads/1/3/4/4/134489835/jopobutuzarojal-gezof-wezifepebezum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pajawazo.pbworks.com/f/fobuzu.pdf
    • http://dajodovilav.pbworks.com/w/file/fetch/144564600/gafokagowus.pdf
    • http://palejemevat.pbworks.com/w/file/fetch/144856014/45620246068.pdf
    • http://gisugakeg.pbworks.com/f/54862509900.pdf
    • http://tugewuvog.pbworks.com/f/nisalalibodinotejixa.pdf
    • http://vonodatob.pbworks.com/w/file/fetch/145081551/pal_pal_dil_ke_paas_movie_song_download_mr_jatt.pdf
    • http://genarozep.pbworks.com/f/tudomo.pdf
    • http://fulusivijomu.pbworks.com/f/606911346.pdf
    • http://gisugakeg.pbworks.com/w/file/fetch/144652794/cuales_son_los_tipos_de_teselaciones_que_existen.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_off0000fc4d.bin
49ac55a42056ebb2ab6794d24786b05e9e7f3b935baf4f2384b004daee2745e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 5308 bytes
font_01_sfnt_off00010e43.bin
cc288a33a31bd24ff7e40b7b8f7416a97e813f726f7beba9ecda6927fe9c06df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 10676 bytes

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