Malicious PDF — malware analysis report

Static analysis result for SHA-256 510d55cc814a9eaa…

MALICIOUS

PDF

77.0 KB Created: 2021-05-03 15:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dc13344a4fd88d64840415e1bda01008 SHA-1: 44972e6470efb7bb8fb2b6df9246fa874bb3d870 SHA-256: 510d55cc814a9eaa3b0a1c80b56cc9a89e2c01dc271e4f86b9b79492c679d92e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URIs, with a primary focus on 'https://ponafet.ru/strik?utm_term=what+is+the+significance+of+the+color+yellow+in+the+yellow+wallpaper', suggesting a phishing or malicious redirection attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a link farm structure on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=what+is+the+significance+of+the+color+yellow+in+the+yellow+wallpaper PDF link annotation
    • http://tpdreport.com/is_horoscope_matching_necessary_for_love_marriageagymc.pdfIn PDF document text
    • http://xolokukifimiv.sportsontheweb.net/84299490448.pdfIn PDF document text
    • http://abistrans.ru/99288653890vji6s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470533/normal_6060a87ca8248.pdfIn PDF document text
    • http://wowitaly.pro/beauty_and_a_beat_song_pagalworlda382v.pdfIn PDF document text
    • http://introdom.ru/bissell_little_green_pro_how_to_usenkbkt.pdfIn PDF document text
    • http://koparikamoze.scienceontheweb.net/2304377905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_603a08f05c9e0.pdfIn PDF document text
    • http://cetakchantek.com/vitatupikusepolasezotugo4fk6i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454041/normal_601cdaaf6ab9a.pdfIn PDF document text
    • http://itprod.space/117925701719mdq3.pdfIn PDF document text
    • http://kino-vezde.ru/43675581547lxvg8.pdfIn PDF document text
    • http://blockhcain.host/3555022579665lax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_a14cedefb9734e69aa0ca85fce607116.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_46df49c6a1a947c9a71ee589e46d2d1c.pdf?index=trueIn 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_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 5484 bytes
SHA-256: d337ad8c8c63d72df57a9f7fac84c79590c34986cae9848228d70ae0dcd11517
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 10612 bytes
SHA-256: 4d6bbd98974dbb5f801fdc71a442ae254e7544d1568759baf1b7811193331a18

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