Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf0dd5e28483bec…

MALICIOUS

PDF

79.1 KB Created: 2021-03-27 11:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 40cfb065f62b107864eb82a504aefe36 SHA-1: c4f262cfd128ac6be684b07f75c3674a44fe7886 SHA-256: 0cf0dd5e28483bec1ebe57778b095d0b0290d3c104823be30b330f6006a92771
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute various files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ponafet.ru/award?keyword=wings+of+fire+book+in+english+pdf+free+download PDF link annotation
    • http://memowelubi.mygamesonline.org/harry_potter_deathly_hallows_part_1_full_movie_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/hbiaat6/download_radio_javan_app_for_mac.pdfIn PDF document text
    • http://sexedate69.site/how_many_lakes_and_rivers_are_there_in_canada4j6lm.pdfIn PDF document text
    • https://cdn.sqhk.co/towitudamuga/m36ijge/belazagujinuduwekubuna.pdfIn PDF document text
    • http://giwosoto.sportsontheweb.net/supitivasigijojobikuj.pdfIn PDF document text
    • https://cdn.sqhk.co/wofosavafiju/1g9jfQY/45700306485.pdfIn PDF document text
    • http://get3creditscores.info/465239862681hlv8.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/decimal_numbers_in_ascending_order_worksheetsr4vwt.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/BibgcPE/ecke_ymca_adventure_guides.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/xutujipux/hiauhhL/retro_collection_fresno.pdfIn PDF document text
    • http://rimka.xyz/kezomozopowixazukijivobs9yy.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/b3b59746-7a9f-4301-817f-fc2bdf9e1bb2/law_of_attraction_planner_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/254cd771-a1bf-4aa1-a50c-f5bf4aceeac5/how_to_calculate_production_efficiency_in_garment_industry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8352bd8e-34fa-42de-be36-db33dbd70506/is_there_a_grace_period_for_nc_drivers_license_renewal.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_7e131dd23e9b487abed7154e0304df87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad98fcf2-ae44-41e5-902d-eb8a6251228b/revuvoxixafadotetozutov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1edc36-84b5-4f0b-9407-7ccb70adfbdb/zerepodivawarizu.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_df1236ca719f4ba4a133bc02d79e9124.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 5612 bytes
SHA-256: fd285efd2aa76a21b9a638742bf0c5e45474748bcec4ccf1fb1493b6a59ee055
font_01_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 10440 bytes
SHA-256: 7466e90a89a8728ea2642e16a3c472faa50ca693eae8d118a82345e9b20913df
font_02_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 16172 bytes
SHA-256: 6e699eab9a6fef16b3ea923df7b93ce1c5cbd97c7a594d359cd98c90be4a35f1