Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef7c5c5ec6274ea…

MALICIOUS

PDF

83.4 KB Created: 2021-09-22 19:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3c2b4b89691a6077bff05a3cdc8b1214 SHA-1: 696700f883da96011c28b09463e114b597157881 SHA-256: aef7c5c5ec6274eac27b19256e1eae08d7dc98185f579466351aec8d3cc83050
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing sites or download further malware. The presence of external URI links and the link farm heuristic suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://spartapr.com/images/upload/file/zokesokasagitoz.pdf In PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/jewixivewilusudez.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/fezemurinesesadupejup.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/tumeloxububuxinogopan.pdfIn PDF document text
    • https://loctra.net/userfiles/file/bodijalosufe.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/mubukive.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/51992451047.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/gabimenuzeda.pdfIn PDF document text
    • https://clickbox.ro/images/file/77725751611.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/47082495560.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/fowugonozikamem.pdfIn PDF document text
    • https://suruburi.net/mm/file/69392206154.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/48528638333.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/37821927396.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/43080620239.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/kejifimikuzalofibe.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/minoxotuxax.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/60860166486.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/57936024040.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/18301170345.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/jaguwevopiwiwofaz.pdfIn PDF document text
    • http://rnralpha.cz/res/file/sebedujizonewu.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/zigof.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/505ce3b8ae2ca4a2b39b3a4e5e93aa08/puvumo.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/37579692948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=linear+rate+of+changePDF 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_off0000e09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09F 10360 bytes
SHA-256: 11895d033a1f884a77f08caf8050a5d0a877c073fff2791756f7ff02f520f5b1
font_01_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 18320 bytes
SHA-256: 72fe4cec183453f2ea315574584d126c1c9168f7a9c40cc9552786d023a01002
font_02_sfnt_off00012868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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