Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb02e55ef043f3b1…

MALICIOUS

PDF

80.1 KB Created: 2021-03-31 12:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8b3f46e00c4d3720ddb9889b22b935e7 SHA-1: 766b5bfc05b5b533cf9fa2bdd29fddc806ee4ab8 SHA-256: cb02e55ef043f3b15e87f52246658a9972c88509d04a267d15ca7f813f18ad63
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-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://dugedepap.ru/award?keyword=manuel+d+anesth%25C3%25A9sie+locale+dentaire+pdf PDF link annotation
    • http://qlemelest.online/pututilijinuluziroliziruljaet.pdfIn PDF document text
    • https://sebumowuvuxeluz.weebly.com/uploads/1/3/5/9/135962316/mudama.pdfIn PDF document text
    • https://jusodizepo.weebly.com/uploads/1/3/1/0/131070216/7a13e060952842b.pdfIn PDF document text
    • http://vatamulejuvovi.22web.org/duvexetiloxafogefo.pdfIn PDF document text
    • http://nunovoxiwanafuz.getenjoyment.net/why_did_the_magna_carta_become_so_important.pdfIn PDF document text
    • http://greatmasters.biz/worlds_of_history_volume_2_kevin_reillyh8gqq.pdfIn PDF document text
    • http://igbusinessabouthelp.com/how_to_reprogram_a_genie_garage_door_keypaden4v1.pdfIn PDF document text
    • http://tilosag.mypressonline.com/93357625190.pdfIn PDF document text
    • http://repochka.site/58772853810hxe04.pdfIn PDF document text
    • https://ritosigom.weebly.com/uploads/1/3/1/4/131453630/masese-gituduneraxo.pdfIn PDF document text
    • https://gawubodukajine.weebly.com/uploads/1/3/0/9/130969599/winutugewiboz.pdfIn PDF document text
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/ragozomenusona.pdfIn PDF document text
    • http://xagugudel.sportsontheweb.net/kuzoxinap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rakulewozagax.rf.gd/lotus_notes_linux.pdfIn PDF document text
    • http://viniwowosur.onlinewebshop.net/jubejukosonolozud.pdfIn PDF document text
    • http://vebadivikini.rf.gd/agri_informatics_book.pdfIn PDF document text
    • http://gupenub.epizy.com/complaint_log_template_excel.pdfIn PDF document text
    • http://voferinokubusob.rf.gd/dadimetupefojovenufape.pdfIn PDF document text
    • http://wepexivir.epizy.com/lomokuxek.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_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 5392 bytes
SHA-256: ef12dda2be4a0801a33e40fb4f7490314c27905113080644e92c1d5ff8a8021c
font_01_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 12972 bytes
SHA-256: 5ded2468f3bef090a3ec12ffa22dda318bf81145e9261f8302011fd56c6dc2f1