Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36841b723f04c17…

MALICIOUS

PDF

64.4 KB Created: 2021-02-03 06:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ea423230ce7192795522165c7806fca4 SHA-1: 944d220f180fa21eb4e88c06fae395202cdaf8b7 SHA-256: c36841b723f04c17ab2ba56cd3d715ab14397d5b90acd0470e58effba4587963
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/123?utm_term=thy+word+is+a+lamp+unto+my+feet+sheet+music+pdf'. This indicates the document's primary purpose is to lure the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious URLs is sufficient evidence for this assessment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/123?utm_term=thy+word+is+a+lamp+unto+my+feet+sheet+music+pdf In PDF document text
    • http://prolac.ru/gofaxoxuzekupedogudpx9o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483870/normal_5fcded093f5a7.pdfIn PDF document text
    • http://rating-bookmaker.ru/80615282113tstrj.pdfIn PDF document text
    • http://ridunculus.com/bao_ninh_the_sorrow_of_warpu7n3.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/ehfhcgg/word_collect_level_1515.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460230/normal_5fcfe58ef1378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5fda4c45a562b.pdfIn PDF document text
    • https://pagafamowadaf.weebly.com/uploads/1/3/4/8/134878907/pawapevudil.pdfIn PDF document text
    • http://docita.fun/batman_arkham_origins_cheats9asct.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369788/normal_5fe039c148f0e.pdfIn PDF document text
    • https://navikeput.weebly.com/uploads/1/3/4/7/134755574/959993.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449769/normal_5fc71c6f05a8a.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/wuzalugiseto/pewadujelod.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/adsense_friendly_blogger_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/wefowirumapevatusi.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/history_of_fiction.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_off0000bd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4B 5540 bytes
SHA-256: 70e649fdc8a960200998faaf08eb38c6f17a77fb310d158cb25957febd7abe5f
font_01_sfnt_off0000d00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00D 10496 bytes
SHA-256: b4ea1a2ef2d4e65a49c08060ef6a8aacb70be315eefc8f2f0c5a682f6bd0b0c5

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