Malicious PDF — malware analysis report

Static analysis result for SHA-256 73703cf14f32f8a5…

MALICIOUS

PDF

75.6 KB Created: 2021-03-12 21:01:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5ffee6fde7e1ad67aa1fa2fa8befd77c SHA-1: d2e6db7f57b7d31f10c31d2a8922711daf7750a2 SHA-256: 73703cf14f32f8a5a4e924d56e9ddf6c3d9e0c8666ce56f02ef23a9dee94db2a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as part of a link farm. One prominent URL, 'https://bologen.ru/strik?utm_term=how+much+money+does+a+criminal+defense+attorney+make', suggests a lure to a site that may be involved in phishing or malicious redirection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=how+much+money+does+a+criminal+defense+attorney+make PDF link annotation
    • https://jurazevogepepa.weebly.com/uploads/1/3/0/9/130969245/xofewojemosuju_vedanepivexelu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445557/normal_5fde3d8367532.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/nrnhjjc/mlb_trade_news_cubs.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/fM7cTJm/piwetanufojebizon.pdfIn PDF document text
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/lizumorivezuxin_daruje_tinor.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/jfqM3ha/children_s_words_beginning_with_d.pdfIn PDF document text
    • https://cdn.sqhk.co/vokalater/ajfhaid/11086922813.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/jhgNifh/watch_wsop_online_free.pdfIn PDF document text
    • https://wawomageton.weebly.com/uploads/1/3/4/5/134584849/6dc525c5b5315.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414687/normal_5ffe449135a5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_5fd129a8b59a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9dfe22-2643-4ecf-823a-6ba080b5d940/marie_kondo_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/2015_gmc_acadia_sle-_2_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/88214243272.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/39789908077.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/weludujaxej.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/xuwimiwogefatabolaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/517e1f7d-be69-4c15-80a5-ef3045a20cd0/transfigure_us_o_lord.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b152ebc-ac54-467b-ad8d-eb8f16db8f0c/what_do_the_characters_in_lord_of_the_flies_symbolize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f376ba95-0dea-4191-ade7-2ef9df39ec11/lowrance_elite_7_transducer_mounting_bracket.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/bsc_biotechnology_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa8acd9-ba5a-4c2a-bd1e-e8f4193cf1de/how_to_reset_a_general_electric_washing_machine.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_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 5480 bytes
SHA-256: 83700f4d4cefa20922709583fcee2d26fe272507d7eb4a522319e34e3692e15c
font_01_sfnt_off0000fd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 10628 bytes
SHA-256: 5335ee3cbf7d0b9d28b7c917ed702e3d27272a9e21e34a07bd345c5812c24dc3

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