Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a34bb0498dbe5bf…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 02:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a764554554783a9df279aafa2bc26459 SHA-1: eab1c299b75d61153392e8ba32ea94d47fd2b613 SHA-256: 9a34bb0498dbe5bfad3e16f7140b9984dd02db2869f5ce9e3a80553449829790
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or are part of a link farm, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a redirection chain, likely leading to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wastran.ru/uplcv?utm_term=6+letter+word+containing+v PDF link annotation
    • https://minhgianggroup.vn/upload/files/63883959745.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613dbb98f0b8b.pdfIn PDF document text
    • http://precisao.org/files/files/41301989749.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/25408035804.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/84719633287.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/bexowapujej.pdfIn PDF document text
    • https://peterdegendt.be/file/fiwebetuseju.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/65923193780.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/tujuwalefosobosugiderowu.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/a84dadeeb8adabbff241d080c8fe1e7b/41560162248.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210921011557669292xfo3cy.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146c5548db0d---lojidutejazeforepinuj.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/zidedepumesimevuger.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/88633062691.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/94739936486.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/42034840351.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/48191526331.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/6742483549.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/18466856008.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/xiwerar.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/88443952900.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/30642834369.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_off0000d206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 10600 bytes
SHA-256: ba93198a677a2131c61fcba9cc4e4f48f3c2282f5cef26ab534131f1c0653021
font_02_sfnt_off00010244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 19892 bytes
SHA-256: 6defae00ca5bdb56380424efe190a239c49b230eac855066e288624cd6be68fe

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