Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a89b832739c587…

MALICIOUS

PDF

72.6 KB Created: 2021-02-23 14:09:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fe629b6ca907f831016e0fe3a81bae8c SHA-1: 7bd5dda3b0e27d5bc34f04b77226606ec52a1f83 SHA-256: 23a89b832739c587a5a0da7a27f3270e5f5e8ed9006d14391f40779c02149d3b
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing users to a suspicious domain. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content.

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://druttle.ru/strik?utm_term=what+materials+do+i+need+for+cricut+maker PDF link annotation
    • https://cdn.sqhk.co/jinubodilev/gMOqAo8/raptors_vs_warriors_game_4_score_update.pdfIn PDF document text
    • http://zesijesagevonot.22web.org/29266479554.pdfIn PDF document text
    • https://cdn.sqhk.co/pixefavenar/cgfPhdh/veterans_day_deals_2019_amazon_prime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://timonuxe.rf.gd/xosovar.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/baby_shark_cartoon.pdfIn PDF document text
    • http://texaliborobiko.epizy.com/free_letter_worksheets_for_pre_k.pdfIn PDF document text
    • http://zopegekole.rf.gd/guided_path_psychological_services_palatine_il.pdfIn PDF document text
    • http://kitasiru.epizy.com/29129023143.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/docker-machine_bash_ip_command_not_found.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/79667738809.pdfIn PDF document text
    • http://likabagumaza.rf.gd/69572988605.pdfIn PDF document text
    • http://lugopupi.rf.gd/google_sheets_drop_down_list_multiple_selection.pdfIn PDF document text
    • http://bozawozu.epizy.com/what_text_structure_has_the_writer_used_in_this_passage.pdfIn PDF document text
    • http://bolesumedinix.rf.gd/battle_chess_3d_game_apk.pdfIn PDF document text
    • http://xamufalifab.epizy.com/nesef.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/23730187170.pdfIn PDF document text
    • http://sawopigemon.epizy.com/edirol_orchestral_software_free.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_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 5340 bytes
SHA-256: 0e79304ea19866ea3873aec63d27a5208c2b2bc18424e0c519430bd3af7b8276
font_01_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 10452 bytes
SHA-256: 81e1c70d7b61faac91079f1e04500f0af631c5f17d2802cb440dfdf23435f2b0

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