Malicious PDF — malware analysis report

Static analysis result for SHA-256 36dfd7a9910a9164…

MALICIOUS

PDF

82.0 KB Created: 2021-03-12 03:23:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 684343240c2fea47321e3eb68bc2fe13 SHA-1: 9fe7cb342fb7b80383c56c0bfbce97f501f1bfc7 SHA-256: 36dfd7a9910a91640339482b9554b1e2a83351694b73cd63d20d461f400aac70
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple external URLs, including one that appears to be a search query for a technical document, suggests a phishing or social engineering lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to deliver malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/wix?keyword=fan+engineering+handbook+pdf PDF link annotation
    • http://eliyalte.com/husky_12_volt_inflator_reviews34mt8.pdfIn PDF document text
    • http://tranquils.space/tinyumbrella_64bithxkzb.pdfIn PDF document text
    • http://instapresent.site/battlefront_2_age_of_rebellion_supremacy_maps8wtcv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390637/normal_5fdfac8da852b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413012/normal_5febfd3e90144.pdfIn PDF document text
    • http://educationonline.website/36276454766kwuzw.pdfIn PDF document text
    • http://naturaleone.space/sonu_mobil_ktphanep85le.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455207/normal_5ff129e85301f.pdfIn PDF document text
    • http://cleaner-inn.club/email_format_for_google_employeesov71x.pdfIn PDF document text
    • http://bio-ita.fun/medical_laboratory_scientist_resume_templatexc3vk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377928/normal_5ffc0fdb5ed1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414691/normal_60270739e3c8d.pdfIn PDF document text
    • http://infonewstravel.com/55483256043p83n1.pdfIn PDF document text
    • http://pubgucbayim.com/horhe_bukaj_knjigee3vha.pdfIn PDF document text
    • http://onlineeshop24.xyz/10845025788h7313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_6010d949204d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_e43f9b8f9ac744c787d025d94dfe7538.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_005dfb33961946a7a5d61af3c5d24271.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_56aa3156cfed4167a3b2fe91be5a7800.pdf?index=trueIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_687def7bdf7e402faa01debdbeafa569.pdf?index=trueIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_4972b07708c04ee491fc541dce6b8326.pdf?index=trueIn 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_off00010418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 5252 bytes
SHA-256: 4aafc858b43562409e1e0fda15445f675e98dbca9f18b8333ae5ffab4d158b4d
font_01_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 11004 bytes
SHA-256: 08fdef35041b809d46d4c589e8b68e3ee19a27a6ae9c6e09c5234e2ef6bbe5a8

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