Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e4c3f0f13ed89f…

MALICIOUS

PDF

88.2 KB Created: 2021-03-21 22:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb658ed50ad8f225a5a28c2073674285 SHA-1: 2ef185a194ebab1997774ac5ca679c80075872b6 SHA-256: c0e4c3f0f13ed89f6c1533991ba84af255164b280e45b2b9b469be314d7d3525
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as manual downloads, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=brookstone+clock+radio+manual
    • https://cdn.sqhk.co/fekigimuzib/gdhKhcq/wifanibikifedenabavu.pdf
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/2c6443e63a.pdf
    • https://cdn.sqhk.co/kewexezaviz/djifih0/42390566796.pdf
    • https://cdn.sqhk.co/matajikiwov/6Mjicid/simply_piano_by_joytunes_apk_premium.pdf
    • http://lulopoboxefon.scienceontheweb.net/wutoraji.pdf
    • http://sepoxudozixo.sportsontheweb.net/metal_gear_solid_v_the_phantom_pain_ps3_mod.pdf
    • https://lotaximadezepa.weebly.com/uploads/1/3/1/3/131379514/51aa2110.pdf
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/jemarirapuli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wizuluworafid/2018_freightliner_cascadia_service_manual.pdf
    • https://s3.amazonaws.com/toniseligiwuzux/happy_birthday_song_remix_free.pdf
    • https://s3.amazonaws.com/tonisefoteka/ford_5000_tractor_manual_free_download.pdf
    • https://uploads.strikinglycdn.com/files/d3a0e1f1-d551-414a-9ee5-0bf8d17c5dce/57489950356.pdf
    • http://muwuvago.atwebpages.com/magefibotufewi.pdf
    • https://uploads.strikinglycdn.com/files/cfd0c6f4-34fd-495d-8641-98010a32181b/zovaladekiwixikaxaritewaz.pdf
    • https://s3.amazonaws.com/zifilobesumafi/speed_queen_dryer_n5_error.pdf
    • https://uploads.strikinglycdn.com/files/91df9929-565f-4033-a557-fbf9a003d1b9/litazu.pdf
    • https://s3.amazonaws.com/wazorixekunafob/whats_the_most_accurate_bible_in_the_world.pdf
    • https://s3.amazonaws.com/xulepiwa/email_template_css_file.pdf
    • https://s3.amazonaws.com/jeromisixinolib/ielts_practice_reading_test_5_answers.pdf
    • https://uploads.strikinglycdn.com/files/12f72a41-7d78-4281-ac5c-96a704efd035/cuisinart_ss-700_charcoal_filters.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a08.bin
5ecafc4d3d4c30a46b9cecc913d3d240914eddc3e6aecde1e647a7c3db3506d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A08 5200 bytes
font_01_sfnt_off00012ba4.bin
93afe9a305c7819c6c9fc61790135b837aa795ada3e43b8cbd265a5b249e9637		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA4 11456 bytes

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