Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd0533533a804fe…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 18:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bcfaff7ec5d533c8f687e9deba22d1be SHA-1: 3a39529952b3619e3c3db247018ca7fa5cf4dede SHA-256: 0bd0533533a804feb495ebed348bff96fc9097247f7a1c8cc6b262e5fcdbe5a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to disposable hosting, indicating a likely phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is a link farm designed to host many redirects. No scripts were extracted, but the presence of many external links suggests the primary attack vector is directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=grammar+and+vocabulary+practice+upper+intermediate+b2+answers+pdf PDF link annotation
    • https://31app.com/userfiles/file/kujavolenakimujobofix.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/20229032791.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/090708012064.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/28360203586.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/fumoxuxosed.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/22481f8a30d07c97dd4fd62e1c89c28b/dufuvafuruxeferinuvi.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/puduvukexurexekidefilepo.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/20928196053.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/middtud02d5hpi5olff41j78hm/73690761074.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/85661717352.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/50785493340.pdfIn PDF document text
    • http://halanmilk.com/upload/files/gexofadeve.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/4088063948.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/35308760464.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/5150364035.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/16635120827.pdfIn PDF document text
    • http://orlickachata.cz/files/files/jeluvinilubiw.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/85189500584.pdfIn PDF document text
    • http://baoveantam.info/upload/files/47762927207.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/31800374341.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/87224061674.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/45493807925.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duriwovidisovutanuximaza.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/96589165128.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_off0000d9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 11444 bytes
SHA-256: 607c2864433585c5e287682eb4f028adac5b673f85f1853943613a2dfb259620
font_01_sfnt_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 21156 bytes
SHA-256: d59cff110f136b9058916c019f14058d48c62c88397f2af8a7d5ea5643e987c2