Malicious PDF — malware analysis report

Static analysis result for SHA-256 445fc763fe3b5e17…

MALICIOUS

PDF

89.7 KB Created: 2021-03-30 18:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f674790c5f5acc6b4496b269b7a6694e SHA-1: e1e60906dfe63abf8b63abe4a57518941109b527 SHA-256: 445fc763fe3b5e1705d3581a368a6c7d00dbf452fdaf2bcbbef6b5e1267633ae
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as academic or resource documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the sheer volume of external links points to a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/award?keyword=repetytorium+angielski+czasy+lingo+pdf PDF link annotation
    • https://luwuruguvuwotom.weebly.com/uploads/1/3/0/9/130969706/d28c473d645d277.pdfIn PDF document text
    • http://pressit.space/xetufexanepikudegekira0ngs3.pdfIn PDF document text
    • https://kogijusixi.weebly.com/uploads/1/3/5/3/135312463/moxebumewubotudutel.pdfIn PDF document text
    • http://kyhni.site/daily_planner_2019_templatea0pvu.pdfIn PDF document text
    • http://the-job.ru/bareboat_charter_agreementthv8b.pdfIn PDF document text
    • http://opensoda.pro/35156467807w6l4g.pdfIn PDF document text
    • http://buylettersonline.com/1167694426245er0.pdfIn PDF document text
    • http://giveaway2020.info/xemajalenogoleliwqzcb.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/how_to_make_traffic_lights_in_powerpoint3k13f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_9263289da383478397399332c5e005ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salade/71802276297.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/smokepurpp_audi_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/30140528293.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_afa2beb6e1e74b2fb768042d7db31d36.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_5f2a51ef623c4bc5a51b8e3007b80d55.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/90953879627.pdfIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_d90632edbf054538adb391477c83470a.pdf?index=trueIn PDF document text
    • https://94cb5446-44f7-499c-8ddd-8d9df3a2db3d.filesusr.com/ugd/9b9c26_0df5c37dcfbe49978d33e79335a98bb3.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_80b9179413d84504970ff6a816993bfc.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_off00011d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 5696 bytes
SHA-256: d7ee61b86d0570ed2a934f85deb3eacf74edb39081740a19d7cecb6017ed8c3e
font_01_sfnt_off00013078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13078 12612 bytes
SHA-256: e82b01ba12061f43f3ab39a4dec3a38a70a31c6dacc8639637cf9e3971b75028

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