Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a5d896a17fa0c8…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 23:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aeb0d79c72d64f70dffd6de4db49bc21 SHA-1: 45180badba736c939d405e099a9a37b462ff2b03 SHA-256: 94a5d896a17fa0c88402ada11c8f9952a4cd1db843ac05bcfc3fcf046a4e51bb
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, likely intended to lure users to malicious sites. The document body is unreadable, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.alex-vasilkov.ru/images/wisdom/file/1872834443.pdf In PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/59033056342.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/69663790121.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f698609e35---44121508768.pdfIn PDF document text
    • https://pindimana.in/uploads/file/manijep.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/tosutomikikiguvoduwufofe.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/67664557069.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/wuzerazarigavefam.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/10725476142.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/89920300003.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/sarugaxo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613effd35d415---jubujivaripijizuku.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/12125544226.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/4883877333.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210906_C1FC87CB8437A61E.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/moduxuganawixaguroz.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/pafenorinidurap.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/jigiguwutexizapeke.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jebixaf.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/zenopogos.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/73286676652.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/mawapaxixabolatulonukelo.pdfIn PDF document text
    • http://someteme.com/archivos/_20210917070939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=simple+animation+app+androidPDF 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_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 10460 bytes
SHA-256: 2a657507f03a212edab9f3daa85d8f242ccb7b41c1c76052a5294f5b45dd7112
font_01_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 17412 bytes
SHA-256: 2db13759551edc35df2def9d8157c05b5e164ea783a527f6699cacf6d057ef1c
font_02_sfnt_off0001321f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1