Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde883fdb904a99a…

MALICIOUS

PDF

86.5 KB Created: 2021-03-23 22:16:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 6b683accbaee069c6de493b44c271553 SHA-1: 3509d9222b85d1ca271fb05fb85f94680f6630e8 SHA-256: bde883fdb904a99a56faff5cc94445349f25f041028a2d437e0e25595d370df9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One such link, https://kuzutuzo.ru/123?utm_term=kruskal%2527+s+algorithm+questions+and+answers, is directly embedded. ClamAV also detected the file as Pdf.Phishing.Trojan, indicating a phishing or trojan distribution intent. The presence of embedded URLs and the link farm suggest the document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/123?utm_term=kruskal%2527+s+algorithm+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/nixibaraje/enMhhhc/space_swift_retro_space_shooters.pdfIn PDF document text
    • https://fosarujup.weebly.com/uploads/1/3/4/6/134624161/6289803.pdfIn PDF document text
    • https://cdn.sqhk.co/guzorata/bgjM6ig/delaware_superior_court_criminal_case_search.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465565/normal_604facd23d305.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447888/normal_5ffb8c9ceb7b2.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/hjbibie/swordsman_marvel_fancast.pdfIn PDF document text
    • https://nurinakeviwiket.weebly.com/uploads/1/3/1/4/131407921/vumojolezi.pdfIn PDF document text
    • https://riligasiguvenu.weebly.com/uploads/1/3/5/3/135392009/39dd078a2.pdfIn PDF document text
    • https://xibimitavidin.weebly.com/uploads/1/3/1/8/131871740/1002945.pdfIn PDF document text
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/fakofawajuloxejive.pdfIn PDF document text
    • https://cdn.sqhk.co/xukigipeduve/eicPhdR/jibogasawobe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_f1527868c6ad484b8708c8bacda8b91b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosagoba/mibawezeduzesebofanufapa.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/masabut.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/sunuvixabo.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/28536861668.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_4e09fe99d29646e6b14fcc7a3821ec48.pdf?index=trueIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_5cbc882fa5374b70ab2dac51b45685b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/falufusu/us_army_dress_uniform_1950.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/ignou_date_sheet_mca_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/17878785965.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/2nd_grade_phonics_worksheets_printable.pdfIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_03857d96aa69401e835219561552cff9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/44892470859.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_off00011059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 5524 bytes
SHA-256: 907ee898f8457a3894d9253faeecf027fe2d6adc40c7f15f675db8c00183a6f6
font_01_sfnt_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 11896 bytes
SHA-256: 44abfac92597f5337203b6ba856bb22524d69fd8d9aa02e76d6572872276176a

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