Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73f3c489ad04159…

MALICIOUS

PDF

89.4 KB Created: 2021-10-07 16:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 96773d9617756716bee50ef459b022f0 SHA-1: 32ced38e4914fc9ca9eb3eaf7fad2d00ae8c7ac7 SHA-256: e73f3c489ad0415963bb7ef32f6dd40ee26bff3e2924428a1fd36ee9737e863d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests these links are intended to direct users to potentially malicious sites. The ML classifier and ClamAV detection confirm the malicious nature of the file, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=icivics+brown+v+board+of+education+answers PDF link annotation
    • https://muachungbaohiem.com/uploads/userfiles/file/gavodabekazeb.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/42183615678.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-11/20210911013106882975.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/27051518771.pdfIn PDF document text
    • http://sartor.ru/upload/files/ribufedoroge.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/nodanif.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/76447974106.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/rudunajevinomixeputapak.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/gomusibimubufabikeperi.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/dedazegov.pdfIn PDF document text
    • http://jfe.hk/userfiles/33462920076.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/nisisekijafaxogaloz.pdfIn PDF document text
    • http://sushifactoryazusa.com/uploads/files/pemaliwowogakut.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/satexavomel.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/57812792783.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/narab.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/28803320159.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/81549343918.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/tasunerenepevanenajatejo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7a063de66---noxanejaj.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/99858651689.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/43583918445.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219388262458.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_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 18776 bytes
SHA-256: 9a81888264a06e4bb0078878de2f5d0a541bcbc53dedde32734caa866a4fdc90
font_01_sfnt_off00012657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6E 10768 bytes
SHA-256: 02b39d524a8faef51b651d2ba628463bc583b44e16333c8181fa4f95eb00c513

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