Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b2f7f4cfdf0d3e…

MALICIOUS

PDF

65.7 KB Created: 2021-02-15 08:26:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1e581b12d370afc2d96910fb0bbda80f SHA-1: bcba2e391dbb72047acbeca21e03ed97793df597 SHA-256: a6b2f7f4cfdf0d3e0768f52f8b4c2114ce3b2e737d5c9b3b7c9cddfbd35c6126
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic indicate the document's primary purpose is to redirect users to potentially harmful sites.

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://leonvi.ru/wix?keyword=no+me+hubieras+dejado+esa+noche PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418001/normal_5fe21dbdd3e74.pdfIn PDF document text
    • http://nanolenka.xyz/zupuxigidagolixexirudadojckby.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_600ae3e292f1e.pdfIn PDF document text
    • http://legiontry.online/the_manga_artists_workbook_chibis4anc8.pdfIn PDF document text
    • http://pepujolajerikur.66ghz.com/where_should_acknowledgements_go_in_a_report.pdfIn PDF document text
    • http://shoes-storie.club/doraemon_game_ho_jaayesu7fm.pdfIn PDF document text
    • http://cetapp.xyz/660957486369jz6v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417817/normal_5fc9e05e7aa50.pdfIn PDF document text
    • http://sportita.fun/xoberuslksz.pdfIn PDF document text
    • http://masonufidowex.iblogger.org/microsoft_word_graduation_invitation_templates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467285/normal_601a7dc57d1f7.pdfIn PDF document text
    • http://mivibowefumar.iblogger.org/blitz_brigade_apk_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sekizipax.rf.gd/alkanen_structuurformule_oefenen.pdfIn PDF document text
    • http://pevurevakube.rf.gd/beloved_sparknotes.pdfIn PDF document text
    • http://pomigijo.rf.gd/99_ball_blast_mod_apk_unlimited_money.pdfIn PDF document text
    • http://gedijusopekud.epizy.com/jexapanobumor.pdfIn PDF document text
    • http://sirusuve.epizy.com/algebra_2_common_core_textbook_answers.pdfIn PDF document text
    • http://rilifufamorupud.epizy.com/haploid_and_diploid_cells_worksheet_answers.pdfIn PDF document text
    • http://tomuvonunilo.epizy.com/purine_metabolism_disorders.pdfIn PDF document text
    • http://zagebixomibolo.rf.gd/kmsauto_activator_office_2016_free.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_off0000c609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC609 5332 bytes
SHA-256: e909d44d17a54ace03d0d9a7a13ae6d440afc4d81b4feb75ffb6b3b39aee6a9a
font_01_sfnt_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 9796 bytes
SHA-256: 08ed9e037d8d54207cdb110b3ca3d11ea2943ac1f3d073ef237a0112bb5c23c8

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