Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd6e0f834fcae0a…

MALICIOUS

PDF

73.7 KB Created: 2021-02-17 21:56:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1be925a35c6299b039934a154a1523db SHA-1: 1055f0b0958a440660522be464e93d8553c883f4 SHA-256: 9cd6e0f834fcae0a89ac801de57a5caa6364c5af4aa462c46bd1bb1451f86293
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

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://leonvi.ru/strik?utm_term=exalted+alchemical+character+sheet PDF link annotation
    • http://bluebadgeform.com/zabafapeputoziztkipp.pdfIn PDF document text
    • http://fuxakuzaporelu.iblogger.org/joworedeminoj.pdfIn PDF document text
    • http://rowajenuw.iblogger.org/1970_corvette_buyers_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/jgcignr/stack_color_game_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/lMiiMjg/88449691871.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/ichjW32/my_little_princess_2011_full_movie_vietsub.pdfIn PDF document text
    • http://tusukezilineji.66ghz.com/sync_3_enable_android_auto.pdfIn PDF document text
    • http://indohealth365.online/chaar_sahibzaade_a_video_songqtedc.pdfIn PDF document text
    • http://radanews.site/hanging_tree_piano_sheet_music_easyudq51.pdfIn PDF document text
    • http://budozezofezuje.iblogger.org/cutting_edge_advanced_student_s_book_answers.pdfIn PDF document text
    • http://alisaborodaenko.design/kivuxejudofojexefeginvx78p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jalasofumikom.rf.gd/bartender_s_guide_to_gin.pdfIn PDF document text
    • http://napubuxuwel.epizy.com/biafra_radio_app.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/60676636327.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_off0000e37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 5204 bytes
SHA-256: a986dae81c0d8e2d9b3a306124c2a40ba8aaf9eeada86015970415c3dcab403f
font_01_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 11020 bytes
SHA-256: 0c119c57fa230c356248ef6319374909522fb7d30fe573ffb262655a2553bed1

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