Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbb4e9ae2b30ff0…

MALICIOUS

PDF

84.1 KB Created: 2021-05-08 14:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b5091886335a4556772f649a1ac45da0 SHA-1: 44f7aa86a22a2967de9558e6bbd0acc94490b531 SHA-256: acbb4e9ae2b30ff096177ea7ebee26433c5cc1a4388353b6db890ed59b9181ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://xajibur.ru/strik?utm_term=what+is+the+cost+of+itil+certification PDF link annotation
    • http://befigter.xyz/drudge_report_mobile_sitepx9fe.pdfIn PDF document text
    • https://cdn.sqhk.co/gojelonub/ehcHE7k/pear_launcher_github.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/Yijihji/star_trek_fleet_command_review_2020.pdfIn PDF document text
    • http://pycnidwzxc.info/princess_colouring_book_mod_apkksy0a.pdfIn PDF document text
    • http://christinaanddavid2019.com/50197882541w81kd.pdfIn PDF document text
    • http://elinekici.online/how_to_install_first_alert_smoke_and_carbon_monoxide_detector65mu7.pdfIn PDF document text
    • http://ogranicbio.space/4054641788273f8s.pdfIn PDF document text
    • http://zutelotojenexop.getenjoyment.net/wukikevub.pdfIn PDF document text
    • https://cdn.sqhk.co/sajixobuko/iasigaj/guriwujuzipegel.pdfIn PDF document text
    • http://keniworu.mywebcommunity.org/nakazavap.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/sisaxu/larebavukimarus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/655d1e6c-fab3-43ac-b05e-2eb73a09f6aa/rodowedigopizimolowes.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_95de52f120be4f97bd2c30491eebbfb9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4091537-df44-46a9-a789-ceda066545b3/what_is_favorable_material_price_variance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/863fcd8a-fcda-4ffa-b965-107559b7cbd1/acts_of_paul_and_thecla_catholic.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/fifty_shades_of_darker_grey.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/can_you_get_regular_food_at_taco_bell_during_breakfast.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/chartjs_tooltip_format_currency.pdfIn PDF document text
    • http://vobikeretuwof.atwebpages.com/wordly_wise_3000_book_5_lesson_16.pdfIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_3492f9323b9b409bbe72ec5ce1df511d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/725cefb8-c13f-4f97-b220-45f60f92cc6c/nugigolabunaxadekewif.pdfIn PDF document text
    • https://dc5983eb-04eb-4341-be6e-5f763cf8c8d0.filesusr.com/ugd/979c04_93e27b2738d24126a93958d17bb2158e.pdf?index=trueIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/zowunox.pdfIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_35aed2c11c85421b8024c0c37653e7fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc472ad-9074-4b5f-bcf6-deb3d922b1c8/pharmacology_textbook_by_mustapha.pdfIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_6fcdd0cb78024911b659050eb3822905.pdf?index=trueIn 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_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 4980 bytes
SHA-256: 1a650695ebb269932ea0f136393d52de39fbd73972c7e5314fb947a411c0344a
font_01_sfnt_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 10972 bytes
SHA-256: 1937e5a3ee190beef0584af2368d525accbe38ad38fb3ed9745825c47a1ad19a