Malicious PDF — malware analysis report

Static analysis result for SHA-256 b273d4b4badf95f0…

MALICIOUS

PDF

93.7 KB Created: 2021-03-21 21:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c87a8c8e958ef5360cec2195c5a0556 SHA-1: 1c9378cf9065e1e593a436b1e3775b973cb5b67d SHA-256: b273d4b4badf95f08eddd01828788568e512a86990ed0e0c0383f92ae726c533
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or phishing. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external links, suggesting a malicious intent to redirect users. The presence of embedded URLs and the ClamAV detection further support a malicious classification, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/strik?utm_term=colorado+ged+math+practice+test
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/2922984.pdf
    • https://cdn.sqhk.co/zusisoko/iTJUgel/40906188814.pdf
    • http://wupidubame.mywebcommunity.org/neurological_disorder_books.pdf
    • https://nulijuvak.weebly.com/uploads/1/3/3/9/133986618/rolijoripakafuloma.pdf
    • https://cdn.sqhk.co/sinemajud/jahavaY/schoology_untuk_laptop.pdf
    • https://cdn.sqhk.co/gobopovupav/chiiejj/cnc_vmc_programming_institute_in_delhi.pdf
    • https://cdn.sqhk.co/tabuguran/jghjQge/dog_mods_for_minecraft_1._7._10.pdf
    • http://winclean-shop.space/devi_chitralekha_ji_photovgiyf.pdf
    • http://varietystore.website/dexavrtz9d.pdf
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/nulen.pdf
    • https://fetarulezi.weebly.com/uploads/1/3/4/4/134487317/794258ee4fd2bd6.pdf
    • http://fortuneo.best/6005404475sf0w3.pdf
    • https://cdn.sqhk.co/nigalasiline/5ighdYz/58513316421.pdf
    • https://vesodadetuvi.weebly.com/uploads/1/3/2/7/132740638/matibol-romimoke.pdf
    • http://eurostore.info/vuvubanuwixokazorasotenen1lq.pdf
    • http://vas-rem.ru/98529827447coa4a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_d67dc11bf4af4967a1e77ee2818f18f7.pdf?index=true
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_75acfcfe694545f796044997d26d8126.pdf?index=true
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_7f7c0ff5fe344b74a8c605f23fd628bc.pdf?index=true
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_ce01dadce4334de2ac3c2910902c75a5.pdf?index=true
    • https://09d7e2b9-79a3-4876-9e00-73a1ba4263a4.filesusr.com/ugd/92fcd7_189c697b4d0a47e59e7af1f26eb05a22.pdf?index=true
    • http://dugerem.atwebpages.com/cake_boss_recipe_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012617.bin
504ce06c93e3548508a1545775df36e5887ab55669a70795b1a6a130b2206ed4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12617 5392 bytes
font_01_sfnt_off00013832.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13832 1800 bytes
font_02_sfnt_off000140bf.bin
851586ee742985d9a83bff81b93a5386a4d9930ee03e7c60baafb8139a704533		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140BF 11368 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.