Malicious PDF — malware analysis report

Static analysis result for SHA-256 2626133987f903d2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 04:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 193516697a5e13332c39953cda1c9f96 SHA-1: 0dec6877779a27a38bb9dec725645acbfb64abe3 SHA-256: 2626133987f903d241b958d99fde2d790628945badc50c24520720c5ba45eae8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to suspicious PDF files, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://damiel.eu/userfiles/file/88565819355.pdf In PDF document text
    • http://4998horo.gmmwireless.com/contents/files/nidejijifekorizes.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/zobanaviwapesenakiwuw.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/sovezuxopolokut.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/kosisezutuwuwovoponeze.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/kukabupotedimedexemo.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/12164033729.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/gowanisevenamigelo.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/21946486883.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/deletitapogopis.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/6986726957.pdfIn PDF document text
    • http://es-iyashinomori.net/yamituki-n/uploads/files/nekurisuwotoxonizasivog.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/lakona.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/21969039663.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/81350558110.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/62556230343.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5189e4de9---sujaxa.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/jokoguxewijoli.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/safadiwizikumikitanonoz.pdfIn PDF document text
    • https://fasleh.net/Files/files/vatelikitavuxobuz.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/nafejexata.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9e02b5ac---zuxov.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/23342419513.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/wogawagaduzanakafelaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=simcity+buildit+obbPDF link annotation
    • https://easyown.ddproperty.com/datas/files/3326509553.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_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 18828 bytes
SHA-256: 7c49773d9a3724391a44b6b40fc8b2c7f53effbe87da97f9d2f5fab949a2b94a
font_02_sfnt_off0001267e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267E 10292 bytes
SHA-256: faa93f0b972be1540f52b53fa010ac449bd1c0a882ab87d03b3c5322514212be

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