Malicious PDF — malware analysis report

Static analysis result for SHA-256 483064c4f38a1132…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 10:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 430448fcddfc5128bc0674e285993164 SHA-1: 47b2749a34b673e917b3f404a526b345adc6a5f6 SHA-256: 483064c4f38a11323796f6999aa8f9ff61f5c4a53872fec1432bfa167f882221
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://ketchas.ru/uplcv?utm_term=gunship+battle+2021 PDF link annotation
    • http://fivelscope.net/fckimages/posilezosunarimeki.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210915222256.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/sidawagiba.pdfIn PDF document text
    • https://ewt.cz/res/file/46706892468.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/1716932989.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/58833084714.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/99f54aee199caeb8f864ffb3ac1f626d/99636543490.pdfIn PDF document text
    • https://profm.hu/files/file/4656087748.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/xasefudegabinila.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/gejatiduli.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/25585797228.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/82659132888.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109130450465131.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/xodokomipugakidupigu.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/50686277313.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/78565152771.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/butuxi.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/30266927447.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/bofazuguboribaxag.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/todorakapexaluruse.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///97632807614.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/32354042072.pdfIn PDF document text
    • http://ducnhua.com/upload/files/29853215147.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_off0000d178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 10700 bytes
SHA-256: 613cda1add8693192de50431a0df63877d4b7aab559f4937b7727cf2b4525243
font_02_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 17896 bytes
SHA-256: 9ee112d63e9f9e4689e506df9a0e2542da7a8ee56b89307888c3b5983f348e7c

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