Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b7d6e2ab6b5408…

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 00:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c354f0968d2bd350aff07923ab84c631 SHA-1: 127475bdc013994629bc987d5480d177d33fb50c SHA-256: a3b7d6e2ab6b54086075b7088673ac06b6eae40be73daf4f7adbc1022ec85e3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://eksiliotomotiv.com/upload/ckfinder/files/povapipetafokofetame.pdf In PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/fc770efb675736b21a406a90f1911e95/setojopovidolopiwokodubuf.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/66407067821.pdfIn PDF document text
    • http://www.toptehnik.si/images/tulepalomini.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/76638403190.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/pojeke.pdfIn PDF document text
    • http://alvitraders.com/files/15572302179.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/nekufusemi.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/31978842395.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/mijoliruxadime.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/195377612.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/guxeturifeli.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/24938246144.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/kolojirifawemunidirelup.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161383fefc3c19---derewirizojulafujivusap.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/wegisatoxukizumipajawa.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/21070579542.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/95752461322.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/54601144235.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/46500134152.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/90086114770.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/39068217891.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/92314073173.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/bolilamafumujowagipawi.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/89039327249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=breathe+in+watch+onlinePDF 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_off0000d866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 18068 bytes
SHA-256: 65287709f00377fcf3cfa2a1bebe4c4b02b392da326227b570decdb192d58238
font_01_sfnt_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F61 10300 bytes
SHA-256: 6a14655eaf66f706ededc42a5be67d23668e19bed297cce836d8bc0d7d1e3fde