Malicious PDF — malware analysis report

Static analysis result for SHA-256 673184f2b1425b28…

MALICIOUS

PDF

70.4 KB Created: 2021-10-02 14:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e1d68369cf7992ad79e41d619d8ba9b7 SHA-1: c0de7aed9cc83565bc04d2e81a2d0c1601f85adb SHA-256: 673184f2b1425b282a2493edc790c3d575365a36bd45fd318449bca21e5a3134
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded content are consistent with attempts to obfuscate malicious links and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=the+cast+of+step+up+4 PDF link annotation
    • http://managhantasala.net/mailuserfiles/file/30562086208.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9f4ecec7---82816837162.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/26994864731.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/zukoni.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/85599661187.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/40791531250.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/kuzesakivawixedoxima.pdfIn PDF document text
    • http://unibox.lv/files/text/63666994332.pdfIn PDF document text
    • http://ergakiland.ru/files/files/825390140.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/powifexuratimurinusezivak.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/97066767786.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/38045312828.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109132321475409.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/73231682722.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0f0fcfba5---56996077752.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/52157576760.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/7804416281.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/30282221357.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/fotom.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/toneto.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/mixizaku.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/nokabogoxuteleruwisis.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/91163074362.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_off0000b1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D5 10376 bytes
SHA-256: 24324bda78e3c0b2f0b3b4454268149e050961fdf07394da2d372b4674e001d7
font_01_sfnt_off0000c98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 17032 bytes
SHA-256: f1c81332c1bcb8cbb87318a8e4bbed689e4c082a49017693568f19df130ec9db

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