Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1a366552aa2f93…

MALICIOUS

PDF

95.1 KB Created: 2021-09-19 05:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dfd7d96d73f3fb5c7c4ddceb9efd1e61 SHA-1: bc7de0359266128a23f8565269d0b9b5539b53c0 SHA-256: fb1a366552aa2f93b6ed1841c60d4ef335334ceb7b6b5604e19f5f24701ad23a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are linked to disposable hosting and appear to be part of a link farm, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://oniceh.ru/uplcv?utm_term=best+android+games+offline+high+graphics PDF link annotation
    • http://sweepinstyle.com/userfiles/file/vavefodimafenodir.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109080056069195.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/risajeweletemit.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/6426863669.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/wibifupixowu.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/40771704047.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/47210090402.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/fexafowasebadax.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109121657193236.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/dofewoge.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/gajaxidudepalage.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210908123829.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/sadibevudiv.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/14472958735.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gogowop.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/lewidofud.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161457793864b4---savajogekosawipezezubewag.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/113940153761350de37270f.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/73044531831.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/kogedivikapu.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/8339328124.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/darupanudobuwoje.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/7001274ic6fbs1agjm2v4l4g93/61444422773.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/71636535952.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/97652662884.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/mevowikak.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613488b019ed7---5219709024.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_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 11120 bytes
SHA-256: b1bf46c3e8d10cc71b17e1de9f989850bbae2c79d23e47f2e3f9425ec022c7ad
font_01_sfnt_off00012931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14143 17388 bytes
SHA-256: 01d2d41cfe279a397ad59b30456a3360af2e263d40a2b38223bc5d9bf65f2d01