Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e805fb02ca1f09…

MALICIOUS

PDF

76.0 KB Created: 2021-03-26 18:24:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f2f3cf002e8c894275928dd0c20a0fb9 SHA-1: e0910f47bb8596efe03daa4fcf5b6218d9f9cc1a SHA-256: f9e805fb02ca1f096b1bcca3ee7a63d68fc69f6d023d45832211682821d0ef4e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, contains text related to a 'Boston Celtics schedule', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jumiwimov.ru/award?keyword=boston+celtics+schedule+2020+20+pdf PDF link annotation
    • http://wivuperafuzo.mypressonline.com/zepaxikagolozezetu.pdfIn PDF document text
    • http://wovugikanagak.scienceontheweb.net/angle_of_elevation_and_depression_trig_worksheet.pdfIn PDF document text
    • http://geloxexomub.iblogger.org/ketogene_ernhrung_lebensmittelliste.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/fender_mustang_2_footswitch_schematic.pdfIn PDF document text
    • http://wozuwekifebar.iblogger.org/how_much_dry_ice_for_sodastream.pdfIn PDF document text
    • http://hookup755.fun/18253652018l2e1w.pdfIn PDF document text
    • http://wivupivipewezap.mygamesonline.org/81337941366.pdfIn PDF document text
    • http://salejozokaboruz.22web.org/nafozoxalokikulosetudesi.pdfIn PDF document text
    • http://ufenmac.com/how_to_use_qualitative_methods_in_evaluationo7qbp.pdfIn PDF document text
    • http://hookup756.fun/ptt_iadeli_taahhtl_posta_cretizhfxq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_29455f44c9984d96831be4e17b851817.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_f80f531921dc4f1ab56a80804a8d6551.pdf?index=trueIn PDF document text
    • http://tiredosutozol.atwebpages.com/speak_now_3_workbook_free_download.pdfIn PDF document text
    • http://nujebij.onlinewebshop.net/gujugilal.pdfIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_480b8565abf44357b89f5a0be0ab3125.pdf?index=trueIn PDF document text
    • http://makidibe.epizy.com/xixavovizamajapev.pdfIn PDF document text
    • http://gukexusew.epizy.com/autodesk_maya_2010_tutorials.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_off0000e770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE770 5260 bytes
SHA-256: d3cb0e718b3ce205c457eb5256a27cca5886a2be9c8c4c4c8c6304860c5fef4e
font_01_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 12960 bytes
SHA-256: 15bb2f23cbed4eef6b918621ed3de62e85994606771f86705fff8a0cc1b32792

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