Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f15ca10c7a8e456…

MALICIOUS

PDF

89.2 KB Created: 2021-04-01 06:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 133ca18d5a7f127bcd5d48df2416c6a2 SHA-1: fa788572ea5980f48fd9f2dde49436f9301fe518 SHA-256: 3f15ca10c7a8e4561310b7e094fbe98eb0325eaf555f19a47ec568ec51a87075
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one pointing to a suspicious domain 'midufefew.ru' that is likely used for distributing malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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
  • 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://midufefew.ru/wix?keyword=organizational+behaviour+exam+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/zofizitene/jjihghT/19380252058.pdfIn PDF document text
    • http://buliwomof.22web.org/mefanemimabonujaturo.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/eiBhjtI/85813870350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_5fe9acbb177b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_6027c24937cdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486984/normal_5fd980c9427a3.pdfIn PDF document text
    • https://cdn.sqhk.co/domonuxasi/jbhBSvj/microsoft_sharepoint_workflow_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/dhiXibT/gukesevowubedurowexalun.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/QhhLhij/cruise_line_stock_prices_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_5feb37c63954f.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/d7acda5c-43c7-4653-a61d-fdfe80d87b28/surah_maryam_arabic_file_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eff312c-f901-42a0-b1d3-7f196de2183c/8526304925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b23e3b95-a67c-4b2c-9a74-558ed7f821e0/underground_history_of_american_education_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acaf207b-bceb-45c2-953d-93450d995f81/what_does_app_mean_on_spectrum_cable_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8bb48da-992d-4499-b4ee-a0352aa36dc0/pelekekapexejugiguzinoju.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/maximum_ride_graphic_novel_1_read_online_free.pdfIn PDF document text
    • http://jasigobup.epizy.com/vuximot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a72e0b-4bfb-4505-8fd7-106c654cb41d/the_city_of_splendors_a_waterdeep_novel.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/ac_market_apkpure_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/arya_2_songs_doregama.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/citizen_perpetual_bx1001-11l_eco-drive_world_time_mens_watch.pdfIn PDF document text
    • http://zenomidesedi.rf.gd/2016_earned_income_credit_worksheet_1040ez.pdfIn PDF document text
    • http://gozadowosib.rf.gd/tcs_aptitude_questions_2020_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36984274-0de9-4515-b2f5-1d37492462ca/how_to_dispatch_a_vehicle_army.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54bc225-4b93-477e-89df-2aa83c65a48a/comcast_cable_out_ref_code_s0a00.pdfIn PDF document text
    • http://xijivip.rf.gd/what_is_carry_on_luggage_size_for_jet_blue.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_off00011d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 5804 bytes
SHA-256: 19187a262ea69b4de0866d908f151169232e3709fcf88a7c317be4eb17222b29
font_01_sfnt_off000130c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C8 11072 bytes
SHA-256: 8dc30fbb8accbe4ea8b0f781a7c2562439d1a1d45689c8d28091233b7a034a76

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