Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc21593906bb072…

MALICIOUS

PDF

73.0 KB Created: 2021-03-04 04:22:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3cc5917264a00a6e84b4e3b0decdb23f SHA-1: 4e19950f7797c54f011606d0d9c95cbe241b52a4 SHA-256: 8dc21593906bb0721754f84b1c41071308d58c6d2fe05d990ef1cf5ddc76337e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to disposable domains and redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that these links are intended to lead users to malicious sites. The ML classifier also strongly flagged this PDF as malicious, suggesting a high likelihood of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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=how+much+would+it+cost+to+replace+floor+joists In PDF document text
    • http://help-copyrighteamservice.com/excel_vba_check_if_value_exists_in_column_rangebun6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_601a7419eea3d.pdfIn PDF document text
    • http://itdiscounts.info/avengers_endgame_full_movie_linklh4yp.pdfIn PDF document text
    • http://job-finder.space/how_to_calculate_sat_score_percentage_in_egyptyxqpe.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/how_did_absolutism_affect_europexaz8a.pdfIn PDF document text
    • https://cdn.sqhk.co/koporikog/gcOifvu/39103919549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486758/normal_602b68adecc05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_601e02fb25d1e.pdfIn PDF document text
    • http://it50off.info/online_coupons_for_harbor_freight_toolscxc00.pdfIn PDF document text
    • http://vetokikiw.22web.org/what_does_literacy_week_mean.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lovetijif/21582684929.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/88521191109.pdfIn PDF document text
    • http://teruwisap.epizy.com/40704188928.pdfIn PDF document text
    • http://kanabikovokes.epizy.com/lightning_returns_quest_guide.pdfIn PDF document text
    • http://natomilalusirof.rf.gd/33374365468.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_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 5524 bytes
SHA-256: ba338b371e3767f4985156913fcd2e9f196c9481ceabbe401eedd45775987057
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 10628 bytes
SHA-256: b76e369e998054ca4fba060e918f4860d7fe84d5807c834d7449594d73a60cf2

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