Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b91f995148ddb9…

MALICIOUS

PDF

67.3 KB Created: 2021-03-03 21:33:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1d15818dd5d72aa9153521e66a05e856 SHA-1: 3329cc3e40b8a635a22c7c106112be5569ebcca1 SHA-256: 15b91f995148ddb94da26199a5636a27288e07029de67f4846bfbf3cbc43148b
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous embedded URLs pointing to potentially malicious domains strongly suggests a phishing or malware distribution attempt. The ML classifier output of 0.999804 further supports the malicious classification.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=what+is+the+dent+on+the+side+of+a+milk+jug+for In PDF document text
    • https://talowitutujuf.weebly.com/uploads/1/3/3/9/133999148/mokijusudegopirozot.pdfIn PDF document text
    • https://rozogefeju.weebly.com/uploads/1/3/1/3/131398259/9f70f85.pdfIn PDF document text
    • http://bluebadge-support.com/jubuvazetumixumanurui0knk.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/siduxujowobus.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/mjcijgj/1569096450.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/igLieha/sanaruboverubox.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/ijbAejc/highway_moto_rider_2_mod_apk_download.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/xukavevabenodave.pdfIn PDF document text
    • http://xurijozidarov.22web.org/java_64_bit_windows_10_update.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/61502395103.pdfIn PDF document text
    • http://vogudikomi.getenjoyment.net/do_walmart_cashiers_get_drug_tested.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/element_4k_tv_remote_not_working.pdfIn PDF document text
    • http://xezaretidatoro.onlinewebshop.net/werozekobugosumem.pdfIn PDF document text
    • http://daferavore.epizy.com/maze_runner_3_full_movie_free.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/gojulexen.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_off0000cc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC89 5472 bytes
SHA-256: e59f98bfc5828a7fa18c64b105e6d090811db64344108e2fafb176ddafa7e781
font_01_sfnt_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 9532 bytes
SHA-256: 83efc1557c10f45c0c0895587e69d3c0f3f92efab423ab63394cb047664ae3e8

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