Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aea416ab416d442…

MALICIOUS

PDF

73.7 KB Created: 2021-09-15 03:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 31dc4a5e2fbc46d893201759dcedf80d SHA-1: 805dcdff363e27feac850fb6c544c1012a564807 SHA-256: 2aea416ab416d442de2b5eec76eadc9fcd94c4f2a43162ea94d33686eaa07b50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=epson+iprint+app+android PDF link annotation
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141387650119---23959415476.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/73559321762.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/tenapulaboreriwova.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/jagodejogujumiz.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/zodozuritijemoxozewe.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/medez.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/28257177601.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/bivexigures.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/ronezipozonuline.pdfIn PDF document text
    • http://kim-clark.ru/files/file/95571219146.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/34335073715.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/79010965642.pdfIn PDF document text
    • http://compsult.net/userfiles/file/14487641400.pdfIn PDF document text
    • https://projetovm.com/uploads/files/23130262853.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/wowukidiguzurosifixoji.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/52527319906.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/medavufarojutozulap.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/jigukafu.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/49302867837.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/3182579449.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_off0000b9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DD 10192 bytes
SHA-256: d0be1ba93deba73bdcb09d6fde6e03feb7382558e53bac8f1aa387570b37a183
font_01_sfnt_off0000d0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C3 19024 bytes
SHA-256: 76621ea0d84ba60cc72d419f403959918846c4c8a1016c4a4e00492f08c8ed5b
font_02_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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