Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9aad8fd4a616d0…

MALICIOUS

PDF

93.3 KB Created: 2021-03-26 09:29:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5afc2db05f35773a16493e6a68067d45 SHA-1: 563250b5fd4dacab5520910ac46eec5f439d3fe4 SHA-256: cc9aad8fd4a616d010bcdd226f20d2efb933b12cafae169a2ed5834b2cf3db99
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a large number of links pointing to potentially disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://kuzutuzo.ru/wix?keyword=common+trees+word+whizzle+answers PDF link annotation
    • https://cdn.sqhk.co/vovewotutal/hjXggjj/25757374490.pdfIn PDF document text
    • https://cdn.sqhk.co/dokijesu/HPgjidq/skins_us_cast_season_1.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/igceheB/wibiwisifirosuga.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/rrjbnhi/63662194121.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/jcijajg/bowling_3d_strike_free_download_for_mobile.pdfIn PDF document text
    • http://zobebukore.22web.org/36280707412.pdfIn PDF document text
    • http://tumibejum.iblogger.org/netflix_expired_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/jikowuzu/gdfOJTe/xmeye_dvr_software_update.pdfIn PDF document text
    • http://tarenutufitox.66ghz.com/chunar_song_free_abcd_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gidatefasu.rf.gd/chaos_theory_equation.pdfIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_816edec50fe04cdca85d7007959b5bc1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/levumoduf/boolean_algebra_objective_questions_and_answers.pdfIn PDF document text
    • https://4c38db24-2924-4bf2-81c9-04860d987a69.filesusr.com/ugd/a68d8f_611792bc86f94159962aa07f0d9d3f16.pdf?index=trueIn PDF document text
    • http://vokerajud.epizy.com/nursery_rhymes_lyrics_free.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/10181367957.pdfIn PDF document text
    • http://nivuzujele.epizy.com/vending_machine_business_plan.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_db24cc4f12c54edb8c7e34d528e25ce0.pdf?index=trueIn PDF document text
    • https://16fd32d6-95e0-4b29-89ad-7162b4f2ffbe.filesusr.com/ugd/9f4b57_614c04c7fa1e4d5b8ab6da1f6b15f238.pdf?index=trueIn PDF document text
    • http://supitemev.rf.gd/duxutenefur.pdfIn PDF document text
    • http://dafadewu.epizy.com/contemplative_outreach_centering_prayer.pdfIn PDF document text
    • http://puwomuf.rf.gd/will_and_going_to_exercises_worksheet_doc.pdfIn PDF document text
    • https://73ea35ec-f0b0-4773-8bcb-d62b778c7de8.filesusr.com/ugd/a8e976_0c4ece6475d045d790dfae5793e7f9b4.pdf?index=trueIn 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_off000132d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D4 5112 bytes
SHA-256: 9919ea5ea52ce436c3d88b15e1ae9b2ffd2e45b62e43a01cb1025fda3bb21ab2
font_01_sfnt_off0001441b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441B 10488 bytes
SHA-256: 774faef31329d71ec315010d21d9b28ead334359ae773ea2fa2f30acd9392a20

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