Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d6302df812a2ab…

MALICIOUS

PDF

95.2 KB Created: 2021-03-13 12:52:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 913ec403355a61ae70a198f3a0d4ad37 SHA-1: 381539ae9032f66e10b3a2542b04482eeb4826c6 SHA-256: 43d6302df812a2ab69d90c440f559197f562f23bb57eea0b9e7ea73f7f97225d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious and likely phishing-related. It contains numerous embedded URLs, many pointing to disposable domains, which are characteristic of link farms used to distribute malicious content or conduct phishing campaigns. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://resalured.ru/aws?utm_term=canon+rebel+t5i+lens+mount PDF link annotation
    • http://dekoriribazovax.mywebcommunity.org/afro_american_symphony.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/zMEjdOC/zesetudakukalogal.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/Fti5jbm/mlb_playoff_bracket_right_now.pdfIn PDF document text
    • http://slmit.fun/61832072685ukp08.pdfIn PDF document text
    • https://cdn.sqhk.co/tijonodevi/gyIE4y1/podux.pdfIn PDF document text
    • http://doordash.link/today_s_news_fox_youtubeajp7g.pdfIn PDF document text
    • http://copyrightmediahelp.com/learn_english_application_for_androidway2n.pdfIn PDF document text
    • http://kujazudoxiro.22web.org/agent_vinod_film_all_songs_free.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/53930931532.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/jeijgQt/aarp_health_insurance_rates.pdfIn PDF document text
    • http://ibkreactiva2020.com/birthday_cake_images_for_girlfriend_hdl1a1z.pdfIn PDF document text
    • https://cdn.sqhk.co/dusujukakal/xphiUjg/45011646366.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
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_4733b47b5af948aba6a7fbc991031552.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_f4462b063d6f44e08e61936e5d599535.pdf?index=trueIn PDF document text
    • https://bc73a302-93f5-4355-8cc8-485924861394.filesusr.com/ugd/99b222_71a3431ff52b4ea997f1db808309da92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/western_freeway_traffic_report_brisbane.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_dbc349d9508a4cdc9632314dc19bc177.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukutud/bacteria_and_virus_worksheet_answers.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_944a78b18280446b86eac801229de84d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/best_chrome_ad_blocker_android.pdfIn PDF document text
    • http://netozovozuze.rf.gd/52052374661.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/s_chand_biology_class_9.pdfIn PDF document text
    • http://zaxukesaludu.epizy.com/16322735646.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/grade_9_math_worksheets_number_system.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_off00012967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12967 5000 bytes
SHA-256: 3f6f1fc38365b2d40a8d543fc793faa52fd5263e707f5420417e32e5b8255517
font_01_sfnt_off00013a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A52 11488 bytes
SHA-256: bf129441982bcd992726db1dc0fff6085c714d5cd8b278edd52fd0435cbdf494
font_02_sfnt_off0001615b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1615B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3