Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c00b04c659baea…

MALICIOUS

PDF

75.9 KB Created: 2021-03-20 11:20:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4b1fd16aeaac9f9d1986df5ec6dc83d9 SHA-1: 2280d4bf3c724d7f988eb9ac4b868e07aa26fed3 SHA-256: f3c00b04c659baeaa7b219759d75d1528ecee660c7e117bc3b5f98e64d1efc4f
184 Risk Score

Malware Insights

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

The sample is a PDF document containing numerous embedded links, many of which point to suspicious or disposable domains. Heuristics indicate these links are part of a redirector scheme, likely intended to lead users to phishing sites or download malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/strik?utm_term=harrington+on+cash+games+vol+1 In PDF document text
    • http://national-verifyteam.com/prentice_hall_magruder27_s_american_government2ivd7.pdfIn PDF document text
    • http://rolorutebu.sportsontheweb.net/why_is_acetone_more_polar_than_water.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/89788761216.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/yjpPjg6/happy_wheels_2_download.pdfIn PDF document text
    • http://farunoraxukiz.getenjoyment.net/formelsammlung_bruchrechnen.pdfIn PDF document text
    • http://instapresent.site/47600017255wzfdk.pdfIn PDF document text
    • http://fakexexu.sportsontheweb.net/validity_and_reliability_of_tools_for_qualitative_research.pdfIn PDF document text
    • http://bio-ita.fun/512424804791pudo.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/iFDhhja/music_video_maker_app_download.pdfIn PDF document text
    • http://bigswinner.space/raluwoghvhpb.pdfIn PDF document text
    • http://nesobaka9.xyz/muzozugilibuzovutabifp78z.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/dQgqihc/kezixon.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/blank_reaction_time_is_a_stimulus_regg4iw.pdfIn PDF document text
    • http://aycotoro7.xyz/what_was_the_main_goal_of_progressivesz8xnu.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/xokiguxet7tyyu.pdfIn PDF document text
    • http://app-3null.com/what_do_red_beaded_bracelets_meanfkkf3.pdfIn PDF document text
    • http://infonewsuk.site/791085729028ambo.pdfIn PDF document text
    • http://trackcreditscore.info/54775338479yu69q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wugujub.onlinewebshop.net/61327504028.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/aeroplane_punjabi_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/13376832138.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_off0000ebda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 5288 bytes
SHA-256: 41c0ebeba8058fff1e55032f6d0cde9a94d0dc168e5f42467a9efde1f8cd32e3
font_01_sfnt_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 10836 bytes
SHA-256: 6721850aaac60dd5ea18203adfcbc55d53b1eb5acb9a01bb69c5caa40a446a8a

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