Malicious PDF — malware analysis report

Static analysis result for SHA-256 9883ad3c59e8ef91…

MALICIOUS

PDF

86.7 KB Created: 2021-09-13 15:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c41b5fb73f832989cefc199285f649cd SHA-1: 9880eba74aca5fd28f4b4524523ed2bbced9d202 SHA-256: 9883ad3c59e8ef91776fa339af1512b9dfb0baa30f64ea34b58e6d8d904bbf49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=free+android+emulator+for+pc+and+mac PDF link annotation
    • http://yushendesign.com/images_fck/file/1631029027.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/24788325751.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/petowixaxujijafobesubufi.pdfIn PDF document text
    • http://speckrepej.com/upload/file/depasimisavajijemoda.pdfIn PDF document text
    • http://runo34.ru/attachments/file/midenabipuxa.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/motopatunizema.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/af57719534a4a2a7102ffefadabb5c97/13002476657.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/18350778861.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/sudadiwafakolamuvukef.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/lokalologowixib.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/kolalomesamofuzerikedi.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/46111533213.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/puguzutew.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/65625690369.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/tigususarigameliva.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d9bb2239---laxuniporob.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/55253467797.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/zugoj.pdfIn PDF document text
    • https://masukpt2.com/contents/files/40600940302.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/zozes.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/80024972204.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/59759490221.pdfIn PDF document text
    • https://ms1oke.com/contents/files/19069295347.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/tozusewes.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210912112619.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_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 10688 bytes
SHA-256: e8abee79b16e2f83b6da63a9c38b61219265ba84a903281766e42ae07a1c4ee5
font_02_sfnt_off000121bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BF 16784 bytes
SHA-256: e1c00f7550a6bc14287bfaf4ef5d4990ef0b5a4b279d0beb2254adc55f6afac1