Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b02a88c08e2270d…

MALICIOUS

PDF

94.4 KB Created: 2021-04-30 23:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4827660038412aaf96ff756a13d9af68 SHA-1: b55011f16060b706f6031e97eb30b0ab5019e2d1 SHA-256: 1b02a88c08e2270d5cdc3a757e5e9b7cd076f060a070fee7d477e3afa4fc9312
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF link farm with numerous external URIs, including one pointing to 'kuzutuzo.ru', suggests a phishing or SEO manipulation scheme. While no scripts were extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://kuzutuzo.ru/strik?utm_term=are+meetings+allowed+during+lockdown
    • https://givadebar.weebly.com/uploads/1/3/1/4/131437750/6e9fde7b5c8.pdf
    • http://peguxukeziku.sportsontheweb.net/adolescent_health_care_a_practical_guide.pdf
    • http://tonevagewalilu.medianewsonline.com/when_does_the_dork_diaries_movie_come_out.pdf
    • https://radewisuvux.weebly.com/uploads/1/3/4/6/134689192/146579.pdf
    • https://jokiwuruxuwam.weebly.com/uploads/1/3/1/4/131437523/5a2a9e4e3a210e.pdf
    • https://bigorofepomibed.weebly.com/uploads/1/3/4/4/134400252/9bb9d948e970.pdf
    • http://xuzobinemipivor.mygamesonline.org/interpreting_financial_statements_benjamin_graham.pdf
    • https://kasipuxatupar.weebly.com/uploads/1/3/5/9/135966953/620022bd3.pdf
    • https://wimunalowuzew.weebly.com/uploads/1/3/4/3/134360992/banetifokexulev_gikamajosefivoz.pdf
    • https://panasijizikefiz.weebly.com/uploads/1/3/4/4/134446590/54d257b256.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zurovajij/7717502561.pdf
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_e1e5e8b0eba148289d50187fcd0829df.pdf?index=true
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_32530fc4ce26413d9eb8e0c79a17db84.pdf?index=true
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_ac6a628481a045a5aa18bdf082b27467.pdf?index=true
    • https://s3.amazonaws.com/tizowodifi/xalarijedazajufetowokakiz.pdf
    • http://vawerudarasikow.myartsonline.com/12996508831.pdf
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_0836d636f7c34b32981dc63df1ceb505.pdf?index=true
    • https://s3.amazonaws.com/gurowozenupifi/96910834632.pdf
    • https://s3.amazonaws.com/ruzaganog/77291380212.pdf
    • https://s3.amazonaws.com/nisoxow/84492490187.pdf
    • https://s3.amazonaws.com/megulu/turbo_racing_3d_games_apk.pdf
    • https://s3.amazonaws.com/jolituzoji/81227194730.pdf
    • https://s3.amazonaws.com/nosepevozux/gamemaker_studio_2_games.pdf
    • http://dezobod.onlinewebshop.net/ruworejifalobaw.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c02.bin
e0e99f81e08cf34a4ba0051bc39970bad2a89fc80fe11602341985616eda7fb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C02 5404 bytes
font_01_sfnt_off00012e5a.bin
729ef8ee18307bbbad4ef19002aaadae2fe72a0d58370b682fb27b712f099b47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5A 11664 bytes
font_02_sfnt_off000155d9.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155D9 16204 bytes

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