Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfe04024451fe32…

MALICIOUS

PDF

78.6 KB Created: 2021-02-22 22:05:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 75dfc47fbe8eff319a0bd33db820ee90 SHA-1: 10083b43b2e5c1544516ef13215ee6274f8dd257 SHA-256: fbfe04024451fe32ee29fe3c1925e33a879425238a41ae827cf0f8783d63b4d5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://baarspo.ru/123?utm_term=dewalt+7485+vs+745 PDF link annotation
    • http://xumukekuvag.22web.org/33946644795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464311/normal_5fe80e109b9c9.pdfIn PDF document text
    • http://butinejijobu.iblogger.org/accelerated_reader_program_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500200/normal_600f62ee9aa6d.pdfIn PDF document text
    • https://cdn.sqhk.co/miviterul/janolie/beef_broth_packets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446773/normal_60009f298b299.pdfIn PDF document text
    • http://notalebapol.iblogger.org/felofizikirejot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_6019d5fc5e8da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451230/normal_6024710a312a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499635/normal_601f6889a652a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kigavanus/what_is_main_religion_in_china.pdfIn PDF document text
    • http://finuzajobozosom.epizy.com/philips_norelco_shaver_1150x.pdfIn PDF document text
    • http://jokokimalofov.rf.gd/minecraft_appdata_files.pdfIn PDF document text
    • http://pazoluno.epizy.com/corellian_corvette_guide.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 6812 bytes
SHA-256: 705a40f2f1299da93398ac562f39fb8e280a7b0d058145836d6dafd55d8ad212
font_01_sfnt_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 5220 bytes
SHA-256: c5568956e7e80f51c7b4105de53a76997b15b0d0b748046990564bc482916304
font_02_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 10644 bytes
SHA-256: 92efc2b8ed5fe7668f99c15a4727f8a980e57c583d6091966e0421805ddf1943

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