Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19cc7c9d57659f5…

MALICIOUS

PDF

115.7 KB Created: 2021-01-04 16:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7206969fc4c066265f9f572920ce1551 SHA-1: 34765360ec8c2eedd1e74009bc7a267a4ab87e2a SHA-256: a19cc7c9d57659f55dca13355c99a0340a62bd138003ded8df107d191e5ce491
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains an embedded URL, 'https://traffset.ru/123?utm_term=tien+shan+pai+curriculum', which is likely used to redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'Tien shan pai curriculum'. No scripts were extracted, but the presence of external URIs and the phishing detection suggest an attempt to trick the user into visiting a malicious site.

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://traffset.ru/123?utm_term=tien+shan+pai+curriculum PDF link annotation
    • https://cdn.sqhk.co/masunidupag/gY1Bifg/21883061812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_5fdbcd967c2b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_5fe84cb64e935.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuwitide/jbjbhhv/98868524893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461204/normal_5fa9823ee92fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489853/normal_5fd3412847a83.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/pasawexawinogad/hp_pavilion_595_p0084_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5fd16d6-5808-4772-9f04-f5b3776fd4d6/fate_hollow_ataraxia_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cbe3105-a0d5-4ce2-b28d-459c2f759c90/56969874433.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/59809449188.pdfIn PDF document text
    • https://s3.amazonaws.com/wifozuxeku/mivanisavigotugaroxalok.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/90434502882.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/diffraction_grating_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/chromatin_condenses_to_form_discrete_visible_chromosomes.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_off00016d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D77 3400 bytes
SHA-256: 21b6c9dece97b76179b67f5beadd1e2a7226b1d822918ffc8f18f39f933b15c6
font_01_sfnt_off0001797e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1797E 5124 bytes
SHA-256: ac05cb234a842e8b80c41dc3792a33fafdcb0c3a99bdb030c226793f1703f7be
font_02_sfnt_off00018abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ABD 18736 bytes
SHA-256: 0f6358e6ee8cda83b2a0da047b6e3bd0b0912670ed8e1789da4ac83713b1247b

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