Malicious PDF — malware analysis report

Static analysis result for SHA-256 291ab08eefcb3376…

MALICIOUS

PDF

67.9 KB Created: 2021-03-30 02:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b738d52abf03afe0d2a2a6f94babcbd0 SHA-1: d0ecfc9149028926b2bfad2b50efd726f42fc815 SHA-256: 291ab08eefcb3376b3309b766c088db519b96138d0a05e888003c5442538f6ea
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 to suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

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://kuzutuzo.ru/award?keyword=arrays+in+c+pdf
    • https://cdn.sqhk.co/xasexuwosul/9iemgc7/3053575987.pdf
    • https://xedijekotaz.weebly.com/uploads/1/3/1/6/131606072/lumejuverixi_fikukax_dasiki_xavepuvewu.pdf
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/3500479.pdf
    • https://tegeluvosuvu.weebly.com/uploads/1/3/4/8/134873603/roneduvaze_walejasexoluva_vimux_nomobuveg.pdf
    • http://kesisofawa.mygamesonline.org/gaduzazonapile.pdf
    • http://mateguwokalidub.getenjoyment.net/what_are_the_6_ps_of_retailing_mix.pdf
    • https://xovelojedawoka.weebly.com/uploads/1/3/4/6/134662979/wululomiwufiledemowu.pdf
    • http://zuzatew.medianewsonline.com/lowigojajetevanorogomi.pdf
    • https://cdn.sqhk.co/mixaluwekitu/gigcKgd/liberty_general_insurance_online_renewal.pdf
    • https://cdn.sqhk.co/nurijodefa/xijiagh/bawevijokosewuroxuram.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_19f3d1164b8a473a8a637445f592cf09.pdf?index=true
    • http://pizuzol.onlinewebshop.net/96196900453.pdf
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_4d09d9821f62477ebacfa2c7175776ce.pdf?index=true
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_2a03872d68e74c66b4d6f2d1918d115f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6dd57223-5801-42d6-9e03-cdb4b57be4e5/91006112091.pdf
    • https://uploads.strikinglycdn.com/files/f34dbfed-8825-4623-a29e-975489eddcc1/53227320702.pdf
    • http://jigisasamupor.onlinewebshop.net/gagimalopaxuwuwesaw.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_off0000cbaf.bin
a0c314315ac1a40c45534691ec492cb3ae058a656f06f0eea60a2de81fb38d6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAF 5208 bytes
font_01_sfnt_off0000dd84.bin
bdc6920470dd4ab591a21c8c44e8bd62eb3d23f335a5987a19788753287e72c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 10972 bytes

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