Malicious PDF — malware analysis report

Static analysis result for SHA-256 73dd1bc5d048a034…

MALICIOUS

PDF

80.9 KB Created: 2021-03-28 15:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d015d70a03b843eee5c5f1d9e4634a59 SHA-1: 05bd9cf4189b60b5482b218b33f11fc6564074d9 SHA-256: 73dd1bc5d048a0342b20a0d3ff1d3c0e20c804494db621bf181dcb7ab9923ade
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host malicious content or redirect the user. The document body, though heavily obfuscated, contains keywords related to 'Chinese zodiac movie' and 'wkhtmltopdf', suggesting a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://midufefew.ru/123?utm_term=chinese+zodiac+movie PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420764/normal_5fe38c751cf29.pdfIn PDF document text
    • http://mamubisuk.mypressonline.com/29062236721.pdfIn PDF document text
    • http://betogav.22web.org/42812535141.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502178/normal_5fcb5ec68902e.pdfIn PDF document text
    • http://xiguxivevov.sportsontheweb.net/zusaxeforipij.pdfIn PDF document text
    • http://ribipozosotol.iblogger.org/anexar_email_iphone.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/bohemian_rhapsody_guitar_solo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490140/normal_5ffc2b3a9cde1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_60276a87d9cfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412415/normal_6032e38c99e04.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
    • https://s3.amazonaws.com/jupevuxirapi/archero_cheats_android_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80750cb4-5b82-469d-9c0c-012cdddcde57/23188841770.pdfIn PDF document text
    • http://najukelosuned.myartsonline.com/aldous_huxley_island_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/what_is_the_unit_cost_of_a_product.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/73460796960.pdfIn PDF document text
    • http://fiwazabon.rf.gd/diaper_genie_elite_playtex.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/6804240785.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/44895681316.pdfIn PDF document text
    • http://wawuzir.epizy.com/81112649558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e58fbe-564b-48a3-a0ff-757bd22da939/beligunapukuxawesaka.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/wowibafuxuduveve.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/87703173130.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_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 4892 bytes
SHA-256: 49e2b722f280790d46b025a59e5fc3605ae3a1a48d45755c6d37c2e6d175056a
font_01_sfnt_off0001048a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 10332 bytes
SHA-256: 026f939a648514aadd4a879dbee6351b04e43cf748e485a32d91ec6a4997ceb8
font_02_sfnt_off000127df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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