Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f1a410c6e75af5…

MALICIOUS

PDF

75.6 KB Created: 2021-02-04 10:28:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ad08673ab7573b6f6287f03741c746f7 SHA-1: 22fbce0ef239cbbcc300f4d833af1d6a0107600f SHA-256: 65f1a410c6e75af502890fd46d8d953c8a22a416f29a462d608b96ff5833b803
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://jacksth.ru/123?utm_term=weenie+man+song+lyrics', which is likely a phishing lure or a download redirector. The document body, though heavily obfuscated, appears to contain metadata related to 'wkhtmltopdf' and song lyrics, suggesting a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/123?utm_term=weenie+man+song+lyrics PDF link annotation
    • http://mx50off.pro/vebibidipaj8c6m.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/fifexonekorisebovhtvs.pdfIn PDF document text
    • http://fitnesspack.net/jaxixex33cmy.pdfIn PDF document text
    • http://geosen.net/rejojezf6wii.pdfIn PDF document text
    • http://topcreditcheck.info/nupujaxixopevijujstalm.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/the_blanket_by_floyd_dell_questions_and_answerskqf3t.pdfIn PDF document text
    • http://liketime.online/google_pond_voy_un_tener_suertegn6dp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/72806095754.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/tamilrockers_2018_movies_in_malayalam.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/telugu_bible_app_jio_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/37406037582.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/50612525123.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/mexidoporebumidenuf.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/bookman_swash_font.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/jifugaputaxazaju.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/ambali_film_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/after_livro_6_baixar.pdfIn PDF document text
    • http://mepogevotu.epizy.com/homophones_homographs_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/bokawubatusopedos.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_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 5236 bytes
SHA-256: cef688138acd0eb0adadc166ce51954ca7cb6cf8ffc1d0a42c8ab8a404f49edd
font_01_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 10688 bytes
SHA-256: 07a70aab5135fb71eaf235d354551041cae8a097951abeb2724fdbf24db20c4e

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