Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56988e56e94a389…

MALICIOUS

PDF

70.3 KB Created: 2021-02-27 23:35:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: db7a02e0b4ebda68f761628017e67eaa SHA-1: d263fb093698c13fd14f89c6f2752a10359077c2 SHA-256: a56988e56e94a3897c04afc1ea7f501d938574d90e2fa0bba52935188aff7ce9
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic firing for an external URI pointing to 'https://xajibur.ru/123?utm_term=captain+underpants+the+movie+netflix', which is likely a phishing lure. ClamAV also detected the file as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to 'Captain underpants the movie netflix' and the authoring application 'wkhtmltopdf', suggesting a social engineering pretext to drive traffic to the malicious URL.

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://xajibur.ru/123?utm_term=captain+underpants+the+movie+netflix PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490252/normal_5fe5d2cf6ce09.pdfIn PDF document text
    • http://popuboloza.22web.org/4867268066.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450890/normal_5ffab2d0b4a26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407804/normal_5ff4ec2d095e4.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/vefoza.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/novewipogam.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/19635472251.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://faxiruvud.myartsonline.com/statistical_mechanics_mcquarrie_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/hpi_baja_5b_ss_discontinued.pdfIn PDF document text
    • http://nefigubisi.epizy.com/fleetwood_mac_rhiannon_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/bbc_learning_english_pronunciation.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/nitugavinudikituji.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/event_sponsorship_request_email_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 5316 bytes
SHA-256: df9e23a190b4eaaf7c5d484cdc2f3c0cb3cc71d57d33148c0a6fda0d86a7cf8d
font_01_sfnt_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 10536 bytes
SHA-256: 80989d182d55205c43394b58385f3c6eb3bee30cb9cf71341acd503185a51af6
font_02_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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