Malicious PDF — malware analysis report

Static analysis result for SHA-256 508449d71db7158c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 22:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20b640b0ff24690ba65cdc2604cca02e SHA-1: 26ddbe1894ef1ca7e1cf7ce0fddddf093d0c4bea SHA-256: 508449d71db7158cdb25287869a083c72f4a73d0a64aa26a9c470b0b628ff197
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, which is a common tactic for phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://kudamatsu.org/userfiles/file/51717986841.pdf In PDF document text
    • https://viettincapital.vn/upload/files/69849944626.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/nukefukixek.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/99918806342.pdfIn PDF document text
    • http://armanetti.com/images/72723394100.pdfIn PDF document text
    • http://parateam.cz/file/43669592981.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/fuzamodamalofobopizudo.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109020342372249.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a75ccc1b02---resopepilawigutesobuxifoj.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/kagelekil.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/ranafokajanan.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/27891561655.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/nubekatilu.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/5203579582.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/51188037139.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/bupedepenupugi.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/birobawub.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/tanomamajuwegivaxu.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/22643476444.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2c3423b78b3dda4118d95e0f835ffc84/vujuwigakekolidufex.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/zerilitikusuwesukub.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/13958451795.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/kisabez.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/50599268164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=windows+xp+32+bit+ethernet+driverPDF 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_off0000cee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE1 10960 bytes
SHA-256: 034f69d6d7f708c6575e9a4e51ae3abbb260f6922a726c2afc38178c5702789a
font_01_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 19852 bytes
SHA-256: 6fefa1209d6b17ea7102da5f161166c34868127a4f834966f7bae844238d3a3f
font_02_sfnt_off00011bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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