Malicious PDF — malware analysis report

Static analysis result for SHA-256 3842fe120e4aafa9…

MALICIOUS

PDF

103.6 KB Created: 2021-03-17 21:51:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a5b1c4f91449ade855ba15c995a6c1c4 SHA-1: 4ca35f5a0fadf9a9c23b638f54d846315c538156 SHA-256: 3842fe120e4aafa92df2638613b557c870b722ba6f7a42b2f8b353edf036fd38
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or exploitation.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jacksth.ru/wix?keyword=thalamus+and+basal+ganglia+location PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470226/normal_603d4ecb203a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481270/normal_6030154e66ee7.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/polycom_soundstation_2w_expandable_vs_non-expandable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421365/normal_6036c2ad6c975.pdfIn PDF document text
    • http://tekozobobiwo.22web.org/xuxug.pdfIn PDF document text
    • http://bekokasutam.22web.org/chia_s_pass_wifi_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470019/normal_5fdb3ed9124a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476952/normal_604a723405b39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8010da38-a055-466e-a2ca-3885983ab9d8/22866440094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f7eb00-fa2b-4a24-bc6d-8352c301a751/twilight_eclipse_full_movie_download_in_hindi_hd.pdfIn PDF document text
    • http://popofisofol.myartsonline.com/62350897169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90772c38-4c69-46f3-b541-f631dbb24fa6/bimovonazimumiva.pdfIn PDF document text
    • http://tisoparumunezud.epizy.com/81257156252.pdfIn PDF document text
    • http://ditajizuru.rf.gd/travel_reports_a12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b836721-9eef-4a90-af74-f3f7a063015e/how_to_measure_visual_analog_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1335910a-3b7d-49d5-ab2a-fb4e8088d1e3/61092081061.pdfIn PDF document text
    • http://vezavajizuvos.epizy.com/losutiridixika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a4cd1b-315a-425c-97cf-2e61d2d66760/lord_of_the_rings_characters_full_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84fcd9e6-5202-456d-ac24-21c5b5f56829/kifapetegul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d6af7a9-9323-4c56-afac-1741ec12a093/what_does_ankle_jewelry_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/630eedbd-f636-4ef3-9824-a5cb88691aa5/nemesis_board_game_rulebook.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_off00015908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15908 5344 bytes
SHA-256: 4c36ec81e3b9d26129c5c493f8d836e33dedc186bbf13f7f96188aab1b31d26e
font_01_sfnt_off00016b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B0E 11496 bytes
SHA-256: 134dd3f3608189656855a6c0e0761e83e839ed92eecf7ed676beba00cbf622f4

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