Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8ff4cab7f2be42…

MALICIOUS

PDF

77.9 KB Created: 2021-04-04 00:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9d731cffceecdf960733a8a2779bd680 SHA-1: d65a9f03c1b3c2d5459298c0483d026a48299c52 SHA-256: ce8ff4cab7f2be42e62c67c015ec7cec5372c84af53a2b5c3afa9d1a0ab5f51a
186 Risk Score

Malware Insights

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

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 0.9990

Heuristics 6

  • 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 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://seumenha.ru/wix?keyword=letter+of+consent+to+collect+documents PDF link annotation
    • http://lefibipefazefep.mypressonline.com/how_to_catalogue_a_coin_collection.pdfIn PDF document text
    • https://mawanegofarate.weebly.com/uploads/1/3/4/4/134466522/wefiv_xitizidimepijeb_fixem.pdfIn PDF document text
    • https://vesedosaripiwuj.weebly.com/uploads/1/3/1/6/131636692/ea921665a.pdfIn PDF document text
    • https://mewurotimopu.weebly.com/uploads/1/3/1/3/131381658/9d0255bd5e6b1.pdfIn PDF document text
    • https://sunajekivogemaz.weebly.com/uploads/1/3/4/8/134895881/2196837.pdfIn PDF document text
    • https://mulomaninivoxom.weebly.com/uploads/1/3/1/4/131437045/992c2.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/nobakowaxatuguve.pdfIn PDF document text
    • http://sagaxafemet.22web.org/roduvev.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/xopajenorovevisutin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_60459d5fe29eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485718/normal_601d330c9295e.pdfIn PDF document text
    • http://sudilufib.getenjoyment.net/dodemanomujewus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://solezod.myartsonline.com/certified_ethical_hacker_guide.pdfIn PDF document text
    • http://falariwupap.myartsonline.com/meditations_marcus_aurelius_download.pdfIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_42845a348f344ae5a1f593c1349ff6c9.pdf?index=trueIn PDF document text
    • http://belibivizonojo.myartsonline.com/birmingham_tourist_map.pdfIn PDF document text
    • http://marurutefa.atwebpages.com/53601122914.pdfIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_0949e3c16ebc4f099ee1df6edaf09fd0.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_842f3b708116418480004aa31cdae1bc.pdf?index=trueIn PDF document text
    • http://verafewema.rf.gd/89504850588.pdfIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_3dfa95ed4d2f470a96f83af540d4a1a8.pdf?index=trueIn PDF document text
    • http://zuwarikufaz.epizy.com/agar._io_mod_apk_android1._com.pdfIn PDF document text
    • http://kojokiguxan.epizy.com/42425323692.pdfIn PDF document text
    • http://lodumojokexiku.onlinewebshop.net/4194586230.pdfIn PDF document text
    • http://keguwaburafokul.epizy.com/lafimufa.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_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 4896 bytes
SHA-256: 75797402ae61e1d16d8371ae114e983bd6157c6f1ec5535a08ed1f0bd60ee8ef
font_01_sfnt_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 10884 bytes
SHA-256: ac93eda8e140851344292cf845c6c9ff0f9431a1044a8c537a4d6fceb45bff81