Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c6aa6721b3321f…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 05:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 158a52a4eae4562207c3f2029dcb73d0 SHA-1: 9fc78d2a20d075923f4f2bb4312b294b4e8a0c29 SHA-256: 25c6aa6721b3321f4c8688fba79a753ab7ac103791a3721a4157ebb3429675f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://allytemp.ru/uplcv?utm_term=how+to+record+gameplay+on+android+with+sound PDF link annotation
    • http://gatewayhotelbangkok.com/upfile_hotel/files/1387727248.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/87393769571.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/7323901895.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/91872694423.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/jaxuxumuxodidisiz.pdfIn PDF document text
    • http://benetalent.com/upload/files/70809207328.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/33466122218.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210919115014_6olxwd.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/sivuja.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/bazigezozaloseva.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/74060231148.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dadozaxibolagowe.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/84622431931.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/6692ee3e84b5fed774ff59576d952e97.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/tanalajax.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/57232753835.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613978a64a2a5---zawiwuloxatoka.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/kopafizomavexatilerap.pdfIn PDF document text
    • http://kccmaul.com/files/files/66369864064.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/99908767671.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210920061815524.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/69873960039.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/78fab9c781c5d863c172dd84ef5e1f2f/9920675176.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/13821463171.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/safurifotixuriborebi.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/76777461002.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_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 18424 bytes
SHA-256: 0f610c4bbabcbe66a6b97864e05ee628d059ff39323ac9bc70dedc049d7d3120
font_02_sfnt_off00012324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 11252 bytes
SHA-256: e9e690a2a086a06ae9fe3c2a5942b90aae6a8c27f46f412a1e2589df83a8c5a3