Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb37ad311ba9fa7…

MALICIOUS

PDF

76.7 KB Created: 2021-02-17 22:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3e1f8e36974eeb26f7ec5e0aa690caac SHA-1: 55537cdd18ffb0c81966350e10bd45146f59eab3 SHA-256: 9eb37ad311ba9fa7278eeb101a3b31e2f7cd8f41b5bc57fe96dbcb854b2b8784
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with many pointing to disposable hosting and exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment, likely leading to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wb?keyword=black%20and%20decker%20cmm1200 PDF link annotation
    • https://cdn.sqhk.co/nijegonusas/eggM3ii/syfy_sci_fi_tv_series_list.pdfIn PDF document text
    • https://cdn.sqhk.co/kupibetefuko/hcij44W/color_wheel_lesson_middle_school.pdfIn PDF document text
    • http://wawovotem.22web.org/stadt_baden_baden_tourist_information.pdfIn PDF document text
    • https://cdn.sqhk.co/tirekidifole/aC7ihvL/pilot_mountain_bike_trails.pdfIn PDF document text
    • https://cdn.sqhk.co/lanasido/4l6idzQ/23293045095.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393751/normal_5fccd16bf3fbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491426/normal_5fd8b1247afa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393353/normal_5feeac2aa9519.pdfIn PDF document text
    • http://foruzakitotilut.iblogger.org/graphic_design_portfolio_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/aihggji/new_bollywood_songs_collection_zip_file_download_pagalworld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392452/normal_60255612690a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412905/normal_5fd90e887eae4.pdfIn PDF document text
    • http://zulurasovuguloz.66ghz.com/bezikagakedaras.pdfIn PDF document text
    • https://cdn.sqhk.co/kusukogan/vfBigji/43279603837.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wuvasof.epizy.com/dahlia_planting_guide_uk.pdfIn PDF document text
    • http://xugonowelimije.epizy.com/peugeot_android_auto_compatible_phones.pdfIn PDF document text
    • http://witopovuketoj.epizy.com/autoimmune_disease_in_pregnancy.pdfIn PDF document text
    • http://sejojoxo.epizy.com/adenomiosis_uteri_adalah.pdfIn PDF document text
    • http://fenozenexow.epizy.com/travel_itinerary_template_design.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 4896 bytes
SHA-256: 54ae4e26348d49adcbd5daeb23d6c80d6952bd66734ee88ae69972d2c6ce62bf
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 11076 bytes
SHA-256: c1ee220e3ffe33b1470024e4b37e00afe239cac3e6a3a2a393623689ac36ae16
font_02_sfnt_off000117b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B6 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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