Malicious PDF — malware analysis report

Static analysis result for SHA-256 c800551fcd0b3882…

MALICIOUS

PDF

68.8 KB Created: 2021-02-26 13:21:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: fe17bede0f4f62f86b7f136227fa47a1 SHA-1: 951ae047cb3217a915a6571e095e2264e083bc89 SHA-256: c800551fcd0b388258e319a7a54f516cc77df5b67dc4aec77521bc416b82c7c7
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, with several identified as link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the ML classification strongly suggest it's used as a lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=best+f2l+algorithms+j+perm+pdf PDF link annotation
    • http://vurejowug.mypressonline.com/sitexodomekididuwin.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/how_to_study_for_acls_certification.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/87963077331.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/Cgcoaia/jelamo.pdfIn PDF document text
    • http://gebajajax.22web.org/14991613950.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/2018_toyota_camry_hybrid_se_review.pdfIn PDF document text
    • http://zazuvivilug.iblogger.org/26498911673.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/polk_audio_soundbar_remote_programming.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414672/normal_5fcbdcab8609e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_601d7d0d5bbdf.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewakuw/BgcifRk/slighted_meaning_in_bengali.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/dcha1lI/27938583674.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/21422429668.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/chainsaw_sharpening_guide_for_dremel.pdfIn PDF document text
    • http://zabukek.rf.gd/delasa.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/america_s_got_talent_2019_live_performances.pdfIn PDF document text
    • http://motinekan.epizy.com/irobot_roomba_i3_3556_review.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/91993679554.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/stihl_fs_85_pro_carburetor_adjustment.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_off0000cf50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF50 5712 bytes
SHA-256: 74fba8d258ffcf09035a2103694aaad66e5c4add22a3885c80c5512e0c671366
font_01_sfnt_off0000e29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 10304 bytes
SHA-256: 549812d5f62d211cf039938bc8b8d5a7042ada3899488e0d893027b5d03b7b14

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