Malicious PDF — malware analysis report

Static analysis result for SHA-256 018fb7a497452de9…

MALICIOUS

PDF

87.3 KB Created: 2021-03-27 09:51:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c6066c24b06c1dbb9a0f6223c0a6da01 SHA-1: 08504824cbba7cebae20c48d9fc015356452bbc6 SHA-256: 018fb7a497452de9818f972dc9f76414b0c5f8f7d7e329bfb0d9f4f8f1f8a207
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting and some to a known malicious redirector. This suggests a phishing or SEO poisoning campaign aimed at driving traffic to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=couch+to+5k+pdf+bbc In PDF document text
    • https://kujafuzepod.weebly.com/uploads/1/3/1/6/131637430/mukurigofexazal-gikojo-sizotixivi.pdfIn PDF document text
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/kanovesekonare_mitesuj_ziseredofesena_kupiwafarop.pdfIn PDF document text
    • http://jitokinut.iblogger.org/66908435615.pdfIn PDF document text
    • https://dexanobibe.weebly.com/uploads/1/3/5/2/135299911/xizixujokodaf_ximomobi_disabinug_nutinogana.pdfIn PDF document text
    • https://gexipatar.weebly.com/uploads/1/3/1/6/131606255/memate.pdfIn PDF document text
    • http://jirekakeduvinij.22web.org/vorozumeloruzo.pdfIn PDF document text
    • http://xevidome.iblogger.org/aylesbury_grammar_school_6th_form_open_evening.pdfIn PDF document text
    • http://fidesuwuranotif.getenjoyment.net/ms_access_send_email_with_attachment.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e6621b18-112f-451e-96af-747863236dd1/hp_color_laserjet_cp2025_roller_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b422b864-78d0-436e-8c6a-36b33cd43156/16872459895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a80762-7438-42f6-b393-b5dd74b1364f/4361506773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629b9d84-81cb-4300-a48d-0d4a39e7906b/what_does_step_5_in_aa_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c269c74a-5e1b-4b35-a827-e39e25f25871/tidomoletovemapubomasobid.pdfIn PDF document text
    • http://pemisikozawefa.epizy.com/samsung_scx_3405_scan_to_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13fb4619-2245-403b-a259-72004523472c/figorifuva.pdfIn PDF document text
    • http://noroved.myartsonline.com/riterowakobemizalifaremet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2226555d-3fda-437a-85fd-0b4ad9e50afa/baby_gate_with_cat_door_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af38f79-54a1-4de1-95aa-d0ed37f80af0/what_happens_at_the_end_of_vampire_diaries_season_7_episode_19.pdfIn PDF document text
    • http://kanisal.epizy.com/chrome_browser_free_for_win7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b6f95b-929a-49db-9b58-8efce4722d83/much_ado_about_nothing_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718dc78e-b579-42b1-a80c-86350754d5e2/tom_clancys_jack_ryan_actor.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 4688 bytes
SHA-256: fb403dc01c6f031c6a27b4099b4dbbaa84bc80db4f8dd4c65bc445ba3a4d3858
font_01_sfnt_off00011c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 11128 bytes
SHA-256: e4e42ac618dad85236740856a2c9e35a3a1c5f8d8b7d11b37bc50b7c28a3be33
font_02_sfnt_off00014248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14248 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361