Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f5380292e238f1…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 15:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9b3b80628ea8bf8cdade104688910158 SHA-1: ee43a71851db33b9ca9fc99d817e14398fd19002 SHA-256: b0f5380292e238f1bf0eae2ce4428c46c40f1e8a2eee5a08e56646924093a778
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many of which point to disposable or low-reputation domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF acts as a link farm. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://archism.ru/uplcv?utm_term=the+landlady+dostoevsky+pdf PDF link annotation
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19883426155.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109030648251899.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/mojaxof.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/92046465260.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/nakotovamosedosim.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-11/20210911080114187307.pdfIn PDF document text
    • http://kco.su/userfiles/file/48122090737.pdfIn PDF document text
    • https://triosms.com/userfiles/file/27047784527.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/27993236642.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/23236693772.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/16696793181.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/74017538082.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/fubef.pdfIn PDF document text
    • http://eko-uklid.com/files/file/bolexojasujosovezopuliwo.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bbaf9e22b---vumur.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b42b3a0e1cb7b4567d43a3ed510cad0c/siwij.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/64109542724.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/lujadurafigijisofexanokej.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/nuroduwerurutipatunofor.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/96362312021.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/3209650152.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/20694982397.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/59722701360.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/40434685410.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/kejupowukigu.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/99340780961.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_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 18132 bytes
SHA-256: e95e35d1cc10a6e0574bec07a63cdf0d2a31378de578785755f79686ce03c380
font_01_sfnt_off000108f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001210d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210D 10636 bytes
SHA-256: f6d0931570f0737bff83690cd70b4ce8b947ca2257d95743f53fc41c281fa282