Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18e3073a482d4b7…

MALICIOUS

PDF

68.4 KB Created: 2021-02-22 10:26:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a26bbbdd6f3e1d5498e6d4a7f88e206d SHA-1: 9d65a63d380439f30c0afb18930f542e84b77f30 SHA-256: b18e3073a482d4b7cd941de990cc3dbf8a45e1cc552b880617e78464f5cd1b85
192 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also flagged the PDF with high confidence. While no scripts were extracted, the presence of a malicious redirector URL and the 'download button' heuristic suggest the document is designed to trick users into navigating to a malicious site. The document body's garbled nature and the wkhtmltopdf authoring application suggest it may be a malformed or intentionally obfuscated lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=stranded+on+a+deserted+island+game In PDF document text
    • http://gujufifirisin.22web.org/excel_using_apache_poi_in_java.pdfIn PDF document text
    • https://cdn.sqhk.co/muvenetu/dhjgeie/blackpink_top_10_songs_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/CMKidij/zunamofixivexa.pdfIn PDF document text
    • https://cdn.sqhk.co/dawajimet/1vE2Eid/ludo_king_hack_download_unlimited_coins.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwuzuwix/eoHjahh/wunderlist_to-_do_list_tasks_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/wesifarajaru/jhGigeD/free_events_today_in_san_antonio.pdfIn PDF document text
    • http://varuxulibiki.iblogger.org/how_to_set_up_a_brand_new_fishing_rod.pdfIn PDF document text
    • http://xujilutobidiko.iblogger.org/vert_shock_week_4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_602456a03569f.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/vaxebisapesi/minions_game_free_for_pc.pdfIn PDF document text
    • http://ferisokigidakal.rf.gd/fisifewojenisol.pdfIn PDF document text
    • http://vogurumekadobet.epizy.com/48363534155.pdfIn PDF document text
    • http://tesuzegijibonu.epizy.com/d_d_5e_warlock_spells_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/x_random_video_chat_app_for_android.pdfIn PDF document text
    • http://dupikupujetilu.rf.gd/bum_bum_bhole_song_free_2017.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_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 5248 bytes
SHA-256: 2a22de27fca28fe13636be967502d823e43bd6b6dbc08c6e6b9de26437af846b
font_01_sfnt_off0000e3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 9532 bytes
SHA-256: 9c5a443c8f304e5bbf4a0a3d9b4a9c3078e6dde843f064743ceac17d0f35d581

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