Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f318e89a63d2dd…

MALICIOUS

PDF

73.6 KB Created: 2021-03-01 01:50:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e8b057f49c864a3868a0f31c83616b78 SHA-1: fedecead423edaf411cdfed0403892fbc6072091 SHA-256: 37f318e89a63d2dd92f2bed67657c687a960224ebb3d04803d1dbb12fe22a0a4
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to lead the user to a compromised or malicious site. No scripts were extracted from this sample, but the overall structure and URL distribution are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://pelibifir.ru/wix?keyword=kingmaker+maps+for+stronghold+2 PDF link annotation
    • http://netekepipavosis.sportsontheweb.net/pogudebunuvarojubokiwox.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/zuwofatinafategaji.pdfIn PDF document text
    • https://cdn.sqhk.co/pesamelez/OibgeGd/39263018338.pdfIn PDF document text
    • http://legendarycraft.ru/are_testing_centers_open_todaycaaun.pdfIn PDF document text
    • https://cdn.sqhk.co/kerodamajop/MnoGjdb/gegeletumolamet.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/hiiiiic/business_administration_and_management_courses_in_canada.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/gedesisumi/characterization_worksheet_5th_grade.pdfIn PDF document text
    • http://vevubajiziju.epizy.com/microsoft_excel_test_questions_and_answers.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/zilegetuzudunedulijanu.pdfIn PDF document text
    • http://luzawuwu.epizy.com/a4_architecture_portfolio_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/twitter_video_online_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/61213368604.pdfIn PDF document text
    • http://zafagizidop.rf.gd/380597681.pdfIn PDF document text
    • http://xewaxal.epizy.com/wow_classic_boomkin_guide.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_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 5620 bytes
SHA-256: 0b9cad9290cd09f439f46131fa68e3bc7f07c94a5892f1603c3041e75b4a6f74
font_01_sfnt_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 10180 bytes
SHA-256: 0dd5263c87e7fa15d90476954aebca505ec6b1c14f8235416b79402878f3390d

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