Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a7c53857f0c15b…

MALICIOUS

PDF

73.6 KB Created: 2021-02-24 22:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a94989eed6e49689b33b6ef3d0b8c159 SHA-1: cacd3445ea2a105d2aa6ad56c5321a787a0344df SHA-256: 26a7c53857f0c15b787b2d8ac34b67ac3c796a0e25288ecfb0e24e6f88127b51
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically crafted to appear as a search result for 'microwave turntable not turning and not heating'. This technique, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, strongly suggests a phishing or credential harvesting attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the document.

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://jacksth.ru/award?keyword=microwave+turntable+not+turning+and+not+heating PDF link annotation
    • http://gojawufeki.getenjoyment.net/yamaha_portable_grand_dgx-505_user_manual.pdfIn PDF document text
    • https://lorivomewojesab.weebly.com/uploads/1/3/0/8/130813497/loxawesugudiroj-xobalugiforobi-foxoxizovexobe-zopananev.pdfIn PDF document text
    • http://bobixuposu.22web.org/adblock_plus_android_non_root.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/should_internet_be_capitalized.pdfIn PDF document text
    • https://zurukonovode.weebly.com/uploads/1/3/1/3/131379219/7826dc5ee69.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/xogefafosari.pdfIn PDF document text
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/dimutinorasifi.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/how_long_to_see_results_from_5_2_diet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jisijuvod.myartsonline.com/pelutuwos.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/68850592492.pdfIn PDF document text
    • http://pamajaxa.epizy.com/yooka_laylee_achievement_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/34203239357.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/54619658373.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/how_to_use_a_rice_cooker_zojirushi.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_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 5320 bytes
SHA-256: 7af133030713c275aeb1305c4bca817ad4337439a1d8ac31e86255383eeef7d3
font_01_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 10184 bytes
SHA-256: 972b948028a5e0968a172e8fc0911876782da7246bb7456ae7603c21f60b4cc2

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