Malicious PDF — malware analysis report

Static analysis result for SHA-256 204d95bdcf162dcf…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 00:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fdeae250c768a3bb82d1e999bcc79463 SHA-1: 24264b3bc48e287d066e7003373d966d078a727c SHA-256: 204d95bdcf162dcfc12f4df80578d12d01d7e23b7bee867a98acfde1c9b922ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it acts as a lure for phishing or to download further malicious content. The PDF structure and embedded URIs point towards a phishing or spam campaign, likely initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=usb+not+connected+usb+tethering PDF link annotation
    • http://www.tobywells.org/media/fckdir/file/31554713624.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/31244321445.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/24891947811.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365eb41509d---84701076614.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/55290775196.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/47920073097.pdfIn PDF document text
    • http://bastola.org/userfiles/file/fijoxarusisamifobezopu.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/pigomajanuwezitubebij.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/noxonuvukopixusivezude.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/0prk12pkbk3o6j50v4o0lciotf/vugamotewiziga.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/lotigiruraburokexovisik.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/repopeserotivitipibapadap.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210906160305.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/84097916474.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/24927265115.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/69744504772.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/mabupajupumimedufegovan.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/nukelapopetufunub.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/22348672488.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/pifiwutazu.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/goketi.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/18291450764.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/53498158551.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_off0000dccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 10688 bytes
SHA-256: 5702ebd2312de667f48e7682bec933fc784a19b2dcd6d5fdbb22b9c8063cb690
font_02_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 17140 bytes
SHA-256: 990675f4af630570c5863b275fae40b0ee27f5f7c808137f5ca81ec8c2dfd32c

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