Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8cf49e255b4297…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 12:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-06
MD5: 9c2600f60f6693ea1bfb059368e430f2 SHA-1: b9cbb2f942a0c4b9db5c7184a39132d7224ad9bf SHA-256: aa8cf49e255b4297a3365e289117dfef8318b48e4c41f30be9a8c2c755c6327e
174 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=make+simple+android+application PDF link annotation
    • https://calienglish.com/ckfinder/images_store/files/bowefajenejalexefat.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/25305693786.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6d5ab2c20---fibutafalibetejawozitit.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/duvomudodovenuleve.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/95892187726.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/20330133671.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/vefowowuxotelenuso.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4464dbe26c9753dfced1ee88c6a2253f/80391025313.pdfIn PDF document text
    • http://technocom.pl/editor/file/xitidozewe.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/lugutegerekuvosiwozuf.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/30786886518.pdfIn PDF document text
    • https://online-wums.com/files/files/loraletubogukoke.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/niwizolajapalo.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/65341738773.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/29587337535.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631224450.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/dakipojilixezezebud.pdfIn PDF document text
    • http://greenld.com/userfiles/8879900492.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/93947488934.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/44104097774.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/82555292632.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/77582887506.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/2329661813.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/71912738991.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_off0000d9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 16852 bytes
SHA-256: 47c9381ffb870044d677beab1bd64be6e5021f9ca14fca3621cda2507c5c1bd6
font_01_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7B 10760 bytes
SHA-256: ded211aed05e9f436483e963812c1d2c83dd6beda67aed6844009d1dc44f4893