Malicious PDF — malware analysis report

Static analysis result for SHA-256 652f8e76a632ddd2…

MALICIOUS

PDF

80.0 KB Created: 2021-09-24 06:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 776e88411edcce101576b6667c763068 SHA-1: 7405045f016192a7817a55f103f62af73007507e SHA-256: 652f8e76a632ddd2f367d0c63ea75e212883ed4e8b3ee346f3cbd93d0cf4756c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple external URLs are present, many pointing to PDF files hosted on various domains, suggesting a coordinated effort to distribute content or manipulate search engine results. The presence of a 'utm_term_redirector' and a high number of distinct hosts further supports the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://veterky.ru/ckfinder/userfiles/files/93101999023.pdf In PDF document text
    • http://capitaldanceacademy.com/userfiles/files/monosotakexaxamavenufazer.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/56407783117.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/10618139826.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/zofakuxemapikavaf.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/vugogekarodum.pdfIn PDF document text
    • http://salkim.com/userfiles/file/zupebetuwegivoxa.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/22135004140.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/tamifaledefuduzof.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/78305256856.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/witimo.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/vafovanagoluto.pdfIn PDF document text
    • http://prota.ru/upload/files/3379761454.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bfbbad72a---kixubetobudamisig.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/fidegawopuwifuwonavuj.pdfIn PDF document text
    • http://stonebreaker.at/2864377394.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/nagofugufobozozalivi.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109031212484174.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/niwonobasajusaxewidasidir.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/munilow.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161365c8be5e7e---mixabumudetisomofikisa.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/solovotiduxiwa.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/jiwegu.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/lukakajowet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pokemon+go+hack+rare+candyPDF 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_off0000d2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 18532 bytes
SHA-256: 12898b5e44a342817d72587b7b2cb999054b37ff7166cad94f91a0841fe2da23
font_02_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 10620 bytes
SHA-256: f0710776b3642b479c637603ef133658e78ef2650cef68b6810e8df8254d443b