Malicious PDF — malware analysis report

Static analysis result for SHA-256 906101d8035fbadf…

MALICIOUS

PDF

78.1 KB Created: 2021-10-17 17:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 227f2b4f4246bc51a3bf4c67000513f5 SHA-1: 70a5dc7a457284bf7f814839440106f3a78d303d SHA-256: 906101d8035fbadf8ad9ca04e6a06fb8d22151ba7ffa6ca43c5e4e9acad7ce8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high probability of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links to other PDFs, likely for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/64427094964.pdf In PDF document text
    • http://topbondtape.com/uploadss/file/86772853139.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/bogozopuvaxodigabekan.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/33506362633.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/welakutakularadunanu.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/vukemumurovisi.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/40492228339.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/26047382013.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/35544477762.pdfIn PDF document text
    • http://kag.fr/userfiles/file/rerijanizafex.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161654c7f3efd5---25359448048.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/voxogowu.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/lolisofatarakel.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/masalavegukar.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/luxalubatiremokosikuxezi.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/48252713932.pdfIn PDF document text
    • http://levotst.com/uploads/files/samikivukuve.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/34544051890.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159f7e2a0627---manodirunabonuwupezesu.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/fowiwafuri.pdfIn PDF document text
    • http://licausi.it/userfiles/files/pifolid.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/59824478809.pdfIn PDF document text
    • https://kimcert.org/E/file/xinudaxutakugemow.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/51343593307.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/KGDyd8lM0uI/uplcv?utm_term=class+6+science+chapter+4+sorting+materials+into+groups+question+answerPDF link annotation
    • 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_off0000cb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7C 11432 bytes
SHA-256: c9bfd2b4249f3b3b3b4951c8ebd978a348f1ca41fea0d6132ee5341a293dd659
font_01_sfnt_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 17228 bytes
SHA-256: 640c03512a0dfe19ac60005509c92b8ac1ccccf542adcdf95f601589d86c90b1
font_02_sfnt_off00011265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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