Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfba39e5edaaeb4…

MALICIOUS

PDF

71.9 KB Created: 2021-02-18 03:58:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 32e4d03716f572996387b53a7270b668 SHA-1: 8d2b6a6bebc5129c3e9e52884a1d57eae7bff28f SHA-256: 3dfba39e5edaaeb4ad761c853858ad560c169b7fca0ae08fdf3546234c8bc04b
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to 'Nordictrack incline trainer x11i troubleshooting'. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=nordictrack+incline+trainer+x11i+troubleshooting In PDF document text
    • https://cdn.sqhk.co/pubodegosog/jWjifgh/samsung_music_player_no_ads_apk.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/mere_dholna_sun_mp3_song_free_download4jhsw.pdfIn PDF document text
    • http://hopecommunitynaz.com/bare_knuckle_boxing_bookhll68.pdfIn PDF document text
    • https://cdn.sqhk.co/momogajopi/hiEifgc/94482192288.pdfIn PDF document text
    • https://cdn.sqhk.co/dolavalof/4zotkhe/xuwopitilurakoxet.pdfIn PDF document text
    • https://cdn.sqhk.co/gupikekarobo/ie3WKnd/real_cricket_20_ipl_auction_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/fpEichc/nimetinutuvoguzinimo.pdfIn PDF document text
    • https://cdn.sqhk.co/mobirewin/iGhhTiC/the_hangover_2_stu_s_song.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/f7jiij7/44643432555.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/ygi2ie4/billie_eilish_bad_guy_live.pdfIn PDF document text
    • http://operationhomeplate.com/problem_solving_with_c_10th_edition_ebook0t90g.pdfIn PDF document text
    • http://itabody.space/bilubexefuperisivi3mjy8.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/i0Mibjd/71719062477.pdfIn PDF document text
    • http://vizionsmc.net/2652786287922fmh.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/badodemebo/32836305864.pdfIn PDF document text
    • http://nexaware.epizy.com/free_indesign_newsletter_templates_cs6.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/creature_3d_2014_full_movie_720p.pdfIn PDF document text
    • http://povujijizota.epizy.com/72268562203.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_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 5496 bytes
SHA-256: 5a6a88067474746403e7e23863d06a4d0dbbe95c203c3cdaa2d65241704b9701
font_01_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 10480 bytes
SHA-256: 6f999f7d7208b16d25a14e512251483d931efe3b4a1a2ab13e7fe54a21bbf09d

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