Malicious PDF — malware analysis report

Static analysis result for SHA-256 37965a3b81ab9a2d…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 02:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3ad73d67c58a5ffdbc6622fca04fd3e SHA-1: cb23297bf4029d1f6bf0848bdd48880565d1df9a SHA-256: 37965a3b81ab9a2ded59381e9ef67ff1e3e02c54bac7223f7859b05f409ec461
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are indicative of a link farm or phishing infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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://chcial.ru/uplcv?utm_term=how+to+facetime+with+iphone+to+android PDF link annotation
    • https://s-serviss.lv/userfiles/file/39547307343.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/genajilufononuvuda.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/60608262798.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/jujefokanitanimopinam.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/7493023106.pdfIn PDF document text
    • https://cakkue.com/contents/files/giloxomifipaxedidiz.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/gebasur.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/keriwujovixusovafu.pdfIn PDF document text
    • http://stefani.cz/fck/file/gapatifesoj.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210911045920.pdfIn PDF document text
    • http://asid.rw/userfiles/file/66137263082.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210901_E6226287307E4D62.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/zelitanidodotunav.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16148058f250fc---87138179962.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/noxilen.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/wejavef.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/75553944861.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/71341297123.pdfIn PDF document text
    • http://fxlcd.com/upload/file/192070095.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/67441599172.pdfIn PDF document text
    • http://naviway.su/upload/files/bibazoluwebixan.pdfIn PDF document text
    • http://zzquansu.cn/d/files/70926380117.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/57236763977.pdfIn PDF document text
    • http://kes.org/upload/editor/files/galug.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F6 10748 bytes
SHA-256: 7b9ed7f26b7b4e6bd38d8df3dce4f6a5df7ccf7c3b25d4ec78f1ff85ab5f3d95
font_01_sfnt_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 17272 bytes
SHA-256: b40b98cd6a715701e01b0f60b22d49dc22454a9c986cafc81ce45012629fa205
font_02_sfnt_off000115d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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