Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ada3fedbf1dc51…

MALICIOUS

PDF

65.2 KB Created: 2021-03-04 02:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ea41e37b745cf08b9d3795c2d1910875 SHA-1: 27942cedc4a10f0edb9706595b21701b4389fb46 SHA-256: d2ada3fedbf1dc51deb9a841fe12816088cee4d38053393d0919414438358c6f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and potentially malicious hosts, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The presence of external URIs and the high ML classifier score strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of a phishing lure.

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://midufefew.ru/wix?keyword=techlite+lumen+master+cree+leds+250 PDF link annotation
    • http://fixetufuzafix.22web.org/how_to_become_a_trim_carpenter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417118/normal_600baa861e4e5.pdfIn PDF document text
    • http://businessmentality.com/main_tera_hero_songs_free_download_pagalworld.comj320m.pdfIn PDF document text
    • http://it50disconto.pro/what_values_are_reflected_in_your_daily_activitiesm2o59.pdfIn PDF document text
    • http://pihodze.com/goraxetl2gss.pdfIn PDF document text
    • http://ek-arenda.ru/singer_237_fashion_matefpsrh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464865/normal_5ffa215ba71a6.pdfIn PDF document text
    • http://jijufik.22web.org/minuet_in_g_js_bach.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/6NBToTn/67459026259.pdfIn PDF document text
    • http://helpcreditscore.info/chaka_khan_through_the_fire_songhzjq9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bopadobaxu.rf.gd/bovadaxulobujowovepixadu.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/soundcloud_premium_apk_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/free_kalimba_sheet_music.pdfIn PDF document text
    • http://vidomolojo.epizy.com/lamination_sheet_for_door.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/jopibogukatexulotisat.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/bilitide.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_off0000c1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C1 5524 bytes
SHA-256: 515dd963c3290be18e04e7f041ce51e0978c6d3a7eb609da42ffbde5f71a4f62
font_01_sfnt_off0000d45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 10320 bytes
SHA-256: 4c33a4ba32439bdb491f5a230b83052a77fce4fd29a9937af3fb5d9edcabd768

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