Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1f905f21e1bce8…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 07:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 61336d26eda1068ac049ea2ea7091c89 SHA-1: 6876972445a205f45c984907927453ecfe797677 SHA-256: 6a1f905f21e1bce896829fc4630ad7a9f06d51f4f09e4fb7de64e2c8122a5698
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect the user to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://minhanh.com/files/fipotojisekupikopowew.pdf In PDF document text
    • https://weyergans-hcc.lv/userfiles/file/33908830151.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c76cb465e9295cfadd250970c05989d0/20659613439.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/20632053772.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/bowopowawibinurud.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3b31e87be7f6a88dd6546f1a182b38c0/82644839767.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/pokisove.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/75423195119.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/8135947977.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/nogomiverujotitaz.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/pisaguwokamonokunasod.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/66208018725.pdfIn PDF document text
    • https://777mto.org/contents/files/zefedixawaxavale.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/34157533006.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/48999856189.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/totifudeluju.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/60561963025.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/pijubukojafiwezobikojaxi.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/8554443524.pdfIn PDF document text
    • https://kar360.com/resimler/files/lezunudamivibodumal.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/15498962304.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109162325246323.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/wakeverisuxero.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/matovajowa.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/bubemem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=outdoor+drinks+near+mePDF link annotation
    • 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_off0000afab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAB 15460 bytes
SHA-256: eb730cbc05dabbeb7d08986b20e9ceaed9f9a1adad2c22c08ef083388ec94b2c
font_01_sfnt_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 10580 bytes
SHA-256: 26aaf4b7e1aa9c68da6b26cab9846570de165984e0c230ecf54bdb694c5bf0b6
font_02_sfnt_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1