Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb56388fefc77d85…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 05:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 628a46994b3c475a73d61a97618eb276 SHA-1: 1a11019a5fba5064ca733f9d4f9462a85e01ef0b SHA-256: fb56388fefc77d853a2e9f226aac6ea692c28bfa8434fd857e09cdd278bc31a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, with numerous embedded URLs pointing to various domains, likely to obscure the final destination or evade detection. The primary purpose appears to be redirecting users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://vadihosting.com/calisma2/files/uploads/53882849327.pdf In PDF document text
    • https://adium.ru/userfiles/file/gesufeba.pdfIn PDF document text
    • http://decorstore.eu/upload/file/kirikoguludafiwaluzusofis.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/salanal.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/52444947856.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210918_173029.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/15271672238.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/6335684474.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/38608780293.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/32255202651.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/71591595703.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/64072249781.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/28835366060.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/93894677956.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/87259796135.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9fead6be---pibazudibusidezuperade.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/14190307242.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/98926006760.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/suruwuwokusifekutupefab.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/94288864439.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/50262557802.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-21/images/files/47213526157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=one+for+all+heroes+risingPDF 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_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 18252 bytes
SHA-256: ba010c6cc1e2a84ed6cef9b2675db88c372b61719634c3f5f5b85d3fe6adf459
font_01_sfnt_off00010664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 10420 bytes
SHA-256: f870ce1c5f70147abbd67b12b0e2da3fe767ffad112bc76a10de7101a629172b
font_02_sfnt_off00011df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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