Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a43f47e028c567…

MALICIOUS

PDF

84.5 KB Created: 2021-09-15 18:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ec1594b3640c7e0943d001fa830faa80 SHA-1: 1d12f8ec32df7e890480b0760682b9f60305afc2 SHA-256: e4a43f47e028c56724aceb657e4148916cb36ee636869f77dd0218eccd605e5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://smidgel.ru/uplcv?utm_term=bloom%27s+taxonomy+action+verbs+for+learning+objectives PDF link annotation
    • http://kmsenior.org/file/files/40049836943.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/detajolasosofaxewegoxaw.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c6f752fc4a09feafa3b7869664998365/gixikiligidazotirosa.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407e6408712---fezepusonarufonumazadaz.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/28540070976.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/79324944066.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/21419996359.pdfIn PDF document text
    • http://effektfilm.de/files/file/41661695914.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/4263494772.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/lekogosuxupotilonojuwad.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/sutafonibab.pdfIn PDF document text
    • http://www.heksan.com.pl/file/rotawasoneragasipezem.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/95437720067.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/37172322206.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219152255474148.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/40885910772.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210908182048.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/11928239089.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/93837087195.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210903205939.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/13908115829.pdfIn PDF document text
    • http://santeh.md/img/files/kuvomob.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/2103225796.pdfIn PDF document text
    • https://clinicscrm.com/img/files/legagaserav.pdfIn PDF document text
    • https://ratoempat.com/contents/files/36354078556.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/lojirufofavexekuza.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_off0000e2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 17968 bytes
SHA-256: f12a31610d0b3d9ada162fff4a828a17db57eaf1e6d2861af9edd1baac48b6af
font_02_sfnt_off00012950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12950 11320 bytes
SHA-256: 9b689aaf80c094aeb0ee3a20ab7b28494e0145c941a25635bd858572bedd14c6