Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fddab217582eb7e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-22 13:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a2c19ee473d0dbcbe9d92d2063f33f4 SHA-1: 413eb35f0ab946e39a71fc944131a904abc9ef0b SHA-256: 8fddab217582eb7e367224a0efd79f102c9a6ceb81825db2bdce28c26d4b2769
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on potentially untrusted sites, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=super+war+official+apk+free+fire PDF link annotation
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/075373839879fa425349a526355b7d94/lipamera.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/44147338024.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/84891249147.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/82557330817.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/filenufosove.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/wonadaxop.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/lufidagoremurezosu.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/18658673809.pdfIn PDF document text
    • http://ud2-140.com/files/86914341599.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/17604089181.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/75944377332.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7dd902836---wojazadebuzitifode.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/jawidodukerepumakezitova.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/55497430111.pdfIn PDF document text
    • http://falconltd.pl/cache/file/rifulokewem.pdfIn PDF document text
    • https://aromamarketing.md/img/files/zogizusuzofuxabi.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/98495120602.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/xasowuze.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/kosusamulopexi.pdfIn PDF document text
    • http://beta-rc.com/upload/files/90190030689.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/jugudenavalopanikarogolan.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/79207739739.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_off0000afce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCE 10456 bytes
SHA-256: 65e3b4705648d3509d803d2477174f7e2dc94eaf3d50174c643ebaf304bcc49b
font_01_sfnt_off0000c7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B3 17468 bytes
SHA-256: 1ba5be35f35978c2c6f15d6b3f629dd6273a58ba0371308a8541342fbb4cfa03
font_02_sfnt_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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