Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b049310b5b2ce89…

MALICIOUS

PDF

74.2 KB Created: 2021-09-13 13:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 528b1cf32a2b3463f861eedb8be8c954 SHA-1: efb963f4de717c634defc676a5a0b1ec94c24a51 SHA-256: 8b049310b5b2ce89c51e0acb5bcc81a0ef55e759217530075dccba79644b4edd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through multiple sites. No scripts were extracted, but the presence of numerous external URIs indicates an attempt to lead the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=bakusou+kyoudai+let%27s+go+wgp+watch+online PDF link annotation
    • http://clinicaveterinariailmarzocco.it/userfiles/files/rigoxelikabitoro.pdfIn PDF document text
    • http://millecolori.it/images/file/37848411397.pdfIn PDF document text
    • http://orderkai.com/uploads/files/91258866162.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/zagurovapezudotopejamez.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///sujivedepejuwo.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/53540348708.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/11916808622.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/18221374394.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/boxixawapujexabibuxoj.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/82024612049.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ef28fb97---73691785921.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/vufonuvafawarezobito.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/gomomovotitofadakaxiz.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/fumijopekekiniwezef.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/4237392576.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/fulapetubigeziripa.pdfIn PDF document text
    • http://vipdiler.ru/files/file/95483070271.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/75699975124.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/90131100644.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/japoxorixosejunulos.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/38616116358.pdfIn PDF document text
    • https://777mto.com/contents/files/95485184149.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210912032706.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/26809773600.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53a79daad---fejadudomelos.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_off0000ba6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6D 17572 bytes
SHA-256: 4fd610d48b4bcca1ae22c60d86415d848692cf0ad0d0596e453aad0d97799228
font_01_sfnt_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C1 11172 bytes
SHA-256: 3001f2e76305999c59987178b15e045f5077338272e0f6abac7e8adfde4e8969