Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e8ea1050a0cdd4…

MALICIOUS

PDF

73.7 KB Created: 2021-03-03 17:20:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 33f4f0fb946d3691d3b444a9add314a7 SHA-1: 99752186077ec3a285f5c8e55db0300dce0f0b9b SHA-256: 63e8ea1050a0cdd483d78ed4538808e971e225837d0fa5bb40acda59790aed12
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 0.9998

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://vilenefex.ru/wix?keyword=michigan+university+medicine+anatomy PDF link annotation
    • http://bukuminuwakub.mypressonline.com/jivobu.pdfIn PDF document text
    • http://fafasun.iblogger.org/kali_linux_nethunter_android.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/93717818339.pdfIn PDF document text
    • http://copyrighthelpcentral.com/9844006326fqpuq.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/what_is_the_best_affordable_stick_vacuum.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/which_hand_to_wear_bracelet_for_good_luck.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/asmaul_husnah_dan_artinyaogkkn.pdfIn PDF document text
    • http://instapodarok.site/how_to_read_better_and_faster_by_norman_lewisd3ykh.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/pedujiva.pdfIn PDF document text
    • http://xatovapotogu.mywebcommunity.org/41721235971.pdfIn PDF document text
    • http://myshoes.moscow/avis_sur_le_centre_de_formation_europeny8f69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vugugemo.atwebpages.com/37999448320.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/59264694318.pdfIn PDF document text
    • http://suduxegowur.onlinewebshop.net/47659224415.pdfIn PDF document text
    • http://pewulalabes.epizy.com/60782705726.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/lady_midnight_book_2.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_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 5488 bytes
SHA-256: 44be7883d889438ad28a971c68eeb28abcf08391a75f3989c2d665dc452fb0df
font_01_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 10616 bytes
SHA-256: 6fb37c0f692a1e046685ddb7fd33bbf489e2387d56e34b989d5cac9f3f2b5e46