Malicious PDF — malware analysis report

Static analysis result for SHA-256 72361fb5de9c9712…

MALICIOUS

PDF

81.3 KB Created: 2021-03-29 17:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9fc3b47959ba31053079fe17ca80459d SHA-1: 5504ce2527fdfb8311861f228fefa80896c3d68b SHA-256: 72361fb5de9c9712274b3b3c8841cf93ffb230f070f1224ac006a9455990047d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/award?keyword=bastard+devil+pdf PDF link annotation
    • http://fly-drive.online/61874392323m9aia.pdfIn PDF document text
    • http://vkrowl.com/61615463528cycue.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/bewotubalibag-xujutinuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_601659e61f3eb.pdfIn PDF document text
    • https://valiveve.weebly.com/uploads/1/3/4/7/134730204/fogutawafobinevilu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479673/normal_6004bbc341a14.pdfIn PDF document text
    • http://petersikdar.com/how_to_change_2011_chevy_equinox_batteryuonkh.pdfIn PDF document text
    • https://janilanupaga.weebly.com/uploads/1/3/4/6/134673225/4264752.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410695/normal_5fc7c27aede0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fef0431d14a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_60526efe0a9db.pdfIn PDF document text
    • http://prostotit.site/sapoduxikomabafirusxnwc.pdfIn PDF document text
    • https://mafugefowodofo.weebly.com/uploads/1/3/1/3/131378796/2968945.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407795/normal_5ff7a2648e271.pdfIn PDF document text
    • https://gadolelexuzited.weebly.com/uploads/1/3/4/4/134486477/vomug-kejasolimekeza-wedinukadulirep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449000/normal_604e92c0d3eb0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_27f5bf6421d54508a6928b603d14eaa9.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_6c831d11f0184900a2997496a7e843a7.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_975654ffaea14576bd59a5059076253f.pdf?index=trueIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_880c2b0b75df4a7d8980ed3f35959fb0.pdf?index=trueIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_805876a3f61b4e38a88ecf9b8435ac56.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_af50e942b13a4f72a02783a618f119b2.pdf?index=trueIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_0e593691f6b1452088738dd69aab9dbf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 3048 bytes
SHA-256: e75c466d3765961f21e611c18b38909e6397db9038ae1d2f40e0c48109207e17
font_01_sfnt_off0000fd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8F 5144 bytes
SHA-256: 1b866f2cd5be157e1cbd5b365873bcd7543edc6ad8c23763daa03b99df28731a
font_02_sfnt_off00010f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F26 11912 bytes
SHA-256: 614e67f426c7bf834d3cea5b6af714b200a503b905efb5a9486eb06520432d8a