Malicious PDF — malware analysis report

Static analysis result for SHA-256 6147a183d164bee2…

MALICIOUS

PDF

89.7 KB Created: 2021-03-26 10:11:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 88db0439a623a21e9a6533db5306fdb0 SHA-1: aa1454660d0ffc089b56945632d0f1bdc257324c SHA-256: 6147a183d164bee203f30dccfe7333d9b80383b589f58a0c16aabeab7611b7e2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://mezovuduw.ru/strik?utm_term=sql+tutorial+for+beginners+pdf+free+download PDF link annotation
    • http://zutolewe.mywebcommunity.org/bissell_upright_vacuum_belt_replacement.pdfIn PDF document text
    • http://mevesepegubisis.scienceontheweb.net/86206618292.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/jifalurikuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_6044fccc47272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448746/normal_605c85f1a883f.pdfIn PDF document text
    • http://rofuxipof.mywebcommunity.org/11347769692.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/ganaxanedowizidemogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369771/normal_60247ada18c31.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/does_1_rep_max_build_muscle.pdfIn PDF document text
    • http://gigezesuzobe.getenjoyment.net/2762541362.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/how_to_do_conditional_probability.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415754/normal_603667b082804.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gagolabirej.atwebpages.com/denuvobawulojamis.pdfIn PDF document text
    • http://pubamuv.epizy.com/periodicity_chemistry_notes.pdfIn PDF document text
    • http://napusikut.epizy.com/negusawama.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_265fdf2a20b74d6b9cdb31e28c0b7fb0.pdf?index=trueIn PDF document text
    • http://napamewa.atwebpages.com/gipal.pdfIn PDF document text
    • http://ginisanekuxowo.epizy.com/tell_me_about_yourself_in_interview_answers.pdfIn PDF document text
    • http://tiluremuxaz.epizy.com/hubspot_inbound_marketing_certification_study_guide.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_97d8b3218fae4997aceb5b4c5d8b6aa5.pdf?index=trueIn PDF document text
    • http://kexojobozajase.rf.gd/characteristics_of_centrally_planned_economy.pdfIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_e5d91ae0e33e4f5884e29ae92f601af9.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 6568 bytes
SHA-256: 18f4960a52d64bc83d6c304eee4b25c9ca37eec54c0f4efd5701b5568bea1fd1
font_01_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 5668 bytes
SHA-256: f54aedc8d06038e833b96aaa797f624b0fa20c15b320a92a36f79f3cb09fcff5
font_02_sfnt_off000112c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C0 1872 bytes
SHA-256: aaf5dfb5118221ac482a96ed5c4c83d74d47c97130c6f9eadd2fc6b170037092
font_03_sfnt_off00011bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCF 11504 bytes
SHA-256: e3dffa23312d9ca45850f29ff1c790727b389ce4222952d2f4da65fd3989d2ef
font_04_sfnt_off0001432b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432B 16116 bytes
SHA-256: afbdbd02dec82d9be1e07df9ab92004d6e2996c86bdcb9c83a2c1f8ac0d08daa

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