Malicious PDF — malware analysis report

Static analysis result for SHA-256 becb60cb153dbf32…

MALICIOUS

PDF

70.3 KB Created: 2021-01-11 11:07:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 9937ffe8c221c94e850a56e0a10d1f1b SHA-1: 32f72da735c1ba689a8c56151a90dfb30e67a323 SHA-256: becb60cb153dbf32b192477f7a9c13b7cf52f520289704fd94393c91b4c40ea6
106 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is identified as a link farm, suggesting a purpose of directing users to potentially malicious sites. The presence of a PHP webshell heuristic indicates that the file itself may also serve as a backdoor. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • PHP webshell / backdoor source high WEBSHELL_PHP
    The file contains PHP server-side code with the signature of a webshell/backdoor (request input fed to a command/code-exec sink). A webshell takes attacker input from an HTTP request and runs commands/code on the server. Flagged as a malicious hacktool artifact even when carried inside a document or archive — the code does not execute from the carrier, but the file is a webshell.
  • 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://trafffi.ru/aws?utm_term=room+attendant+checklist+template PDF link annotation
    • https://site-1166675.mozfiles.com/files/1166675/48863046744.pdfIn PDF document text
    • https://site-1176671.mozfiles.com/files/1176671/59048183615.pdfIn PDF document text
    • https://site-1168133.mozfiles.com/files/1168133/maze_baby_name_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449395/normal_5fa1b7ffa9e94.pdfIn PDF document text
    • https://site-1175371.mozfiles.com/files/1175371/farming_simulator_16_unlimited_money_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/JjeghmS/3868290155.pdfIn PDF document text
    • https://site-1171749.mozfiles.com/files/1171749/mini_golf_adventure_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tiduro/tazibagikuzakasa.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/nostro_account_rbi_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/http_basic_authentication_url_format.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 5288 bytes
SHA-256: 6f0f524a300151cf6b2ae54da7ebe98bf8abfef98d0f03172cb12777547c77dc
font_01_sfnt_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 11244 bytes
SHA-256: 98dcddb13fd6d691c3016084e32f04a3312b77142d543a432205d92454bf77d8

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