Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d424eb2be6c1e6…

MALICIOUS

PDF

85.3 KB Created: 2021-03-23 01:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b88240442bb55f768c1598f2759f17fd SHA-1: 9bea062817255e3f71d33ce290b5e6d543d47bc7 SHA-256: c0d424eb2be6c1e64c9e62c976d06f6231252259edecb90653165387725f1c48
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://nipisod.ru/123?utm_term=discoid+lupus+pathology+report PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464527/normal_5fdf6567b4321.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/18444647152.pdfIn PDF document text
    • https://tijezelaxupoki.weebly.com/uploads/1/3/5/3/135340387/wilagororanigowofe.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/what_size_tires_does_a_2012_hyundai_sonata_have.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/command_prompt_codes_for_windows_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_60304647ade15.pdfIn PDF document text
    • https://gawofatofuwe.weebly.com/uploads/1/3/1/3/131380275/9829819.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/86530187558.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/craftsman_edger_blade_9_inch.pdfIn PDF document text
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/1617168.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468838/normal_5febc499cb0b7.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/mavati.pdfIn PDF document text
    • https://bafuvigugasud.weebly.com/uploads/1/3/5/3/135308410/9d25d7efd.pdfIn PDF document text
    • http://maritimog.medianewsonline.com/wazitobadubamumevatijesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418778/normal_602256a86f291.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462350/normal_6008dc6aba7a3.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/kovezodepugov/business_card_design_templates_psd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c815f9d1-e172-4db2-998a-1cd146825f76/the_crucible_act_1_quotes_abigail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d1f44e1-158a-4297-9cdf-df607d897bb5/4778860205.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/all_the_stars_are_coming_out_tonight_for_you_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/shark_vac_then_steam_not_steaming.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/what_is_the_difference_between_intelligence_and_investigation.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/sewonekikafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2283dcb6-f172-40d0-a02e-2d2ef521ec4a/does_samsung_replace_screens.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/indian_ich_gcp_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd14172-53a7-466b-8f68-6533762a57ea/lezajijodot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05aec8a6-fccf-473f-ad50-951291c35577/game_answers_word_stacks.pdfIn PDF document text
    • http://xojudemavu.onlinewebshop.net/bradley_electric_smoker_heating_element_upgrade.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_off00010eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB4 5436 bytes
SHA-256: 4c1a65c3ea6707222efe9f7a5ad8e6edee912de32d11b3752c4497f8c68af20d
font_01_sfnt_off0001213a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213A 11180 bytes
SHA-256: 938d094b322d67c68c91c905e85b1af4127d2b84d5a9821a96dfd7632f90200b