Malicious PDF — malware analysis report

Static analysis result for SHA-256 6499136f5883605b…

MALICIOUS

PDF

84.8 KB Created: 2021-05-15 23:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7578de88e69b9823677ef8d360229735 SHA-1: 8b9fa5e04fc85cd58ef0458af49d2c4be789fb12 SHA-256: 6499136f5883605bb6a2f4c2959c52bdd45f9ab5951cb5807fb78750db4a7937
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 0.9992

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://fokemale.ru/strik?utm_term=rese%25C3%25B1a+caballo+de+troya+1 PDF link annotation
    • http://hdsamara.ru/sezefikolagiwigimanazaniqsd.pdfIn PDF document text
    • http://organize.shop/ben_10_addon_for_minecrafttp3zf.pdfIn PDF document text
    • http://setofexperience.site/garmin_935_vs_920xt3rnsq.pdfIn PDF document text
    • http://wonuwomola.iblogger.org/9134768141.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/97344472366.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/6e1733e3-778a-450a-9ab2-88ec181cbee7/duzafez.pdfIn PDF document text
    • http://nexuxawire.epizy.com/chakravyuh_movie_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/m5a78l-m_lx_plus_bios_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71873c2-10eb-425d-9a94-2439659d0d3e/how_to_make_french_questions.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/zefelepaw.pdfIn PDF document text
    • http://bemuvubovewe.epizy.com/elements_compounds_and_mixtures_worksheet_grade_7.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/pexugeparaburav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55781718-de61-4f12-a126-abdc97cbf128/santa_clara_paintball_hours.pdfIn PDF document text
    • http://lawesiwewif.onlinewebshop.net/malaysia_work_permit_application_form.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/mumanetirupizosekojim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dee3333-921e-4afc-8fa3-f3a45f4243b9/5180281459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd54191-e54d-4ef9-99eb-5fc7cf62fb86/23278162710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bae1cb0-087e-483c-8f0d-cb81f04f49e0/bisabugolevubipo.pdfIn PDF document text
    • http://jaforafonox.rf.gd/jpg_to_word_converter_online_free_i_love.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/korean_workbook_for_beginning_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/41657893634.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/how_to_setup_sony_str-dn1080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e2d6b54-29e4-4280-a3ce-60b7abd2de64/how_to_block_my_knitting_project.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_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 5448 bytes
SHA-256: cbdc74e0c7aaf06c0e82d332e424572f1d45b88841f13f2a2c338cfd36746d4f
font_01_sfnt_off00011c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3F 12224 bytes
SHA-256: 34d6bffd67a287eb5bb79582f62d59f6d6ea16a9d2c2577fe39a49abd5d6bfba