Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4226af14d031818…

MALICIOUS

PDF

75.6 KB Created: 2021-03-15 14:55:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 634d27be8e5cac6df2daaccb74f7c6fa SHA-1: 5cfab2bc3c0bbba8a3306488a8dffa0a20c585f9 SHA-256: e4226af14d031818bc2f01adf8161f2a2c78063ace87e49faa66107e2acbe09e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URLs, some of which are hosted on disposable domains. The primary purpose appears to be directing users to external content, potentially for SEO manipulation or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=graffiti+names+ideas PDF link annotation
    • https://xenuwupe.weebly.com/uploads/1/3/5/3/135329542/868af7b1cf0159.pdfIn PDF document text
    • https://lofidebonejiniz.weebly.com/uploads/1/3/5/3/135334880/ratulew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447880/normal_601b32abc210e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_600e55aa488a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413374/normal_6027ca4a9d11f.pdfIn PDF document text
    • https://cdn.sqhk.co/suwezuzifu/bgjhjia/number_counting_activities_for_toddlers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371269/normal_600a538298040.pdfIn PDF document text
    • https://pozefixinez.weebly.com/uploads/1/3/1/4/131454190/wuxelivixap_rafakixur_tofegil_finolupemowab.pdfIn PDF document text
    • https://mokugutareno.weebly.com/uploads/1/3/1/6/131606089/2a13c2643c63b.pdfIn PDF document text
    • https://rejobasagiletez.weebly.com/uploads/1/3/4/6/134642313/jijexuligaxiwegilo.pdfIn PDF document text
    • https://cdn.sqhk.co/gujadozede/djf5jgR/14674735524.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446776/normal_5fec15f728ae6.pdfIn PDF document text
    • https://jitebemaduk.weebly.com/uploads/1/3/4/6/134692965/voxivet_wafamifaxema_xarekorajupe.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/TmigZIp/unnatural_selection_lyrics_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379731/normal_5fd8770bb0915.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450631/normal_5fcff51e2907c.pdfIn PDF document text
    • https://cdn.sqhk.co/marezotije/jXhC0WE/ringtone_sms_samsung_galaxy_s7.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/ggmshj9/dr_martens_1460_pascal_reversible_sequin.pdfIn PDF document text
    • https://mefapepuj.weebly.com/uploads/1/3/4/3/134310437/kukegum-lajux-pogilepixel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_601734a08879a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_c8aede6e4d2e490f97c2318eb4045074.pdf?index=trueIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_d9e45d10f0a3478890e5f606aaa5b73b.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 5052 bytes
SHA-256: 4b5975fb3a3bcc6247889c4eccfb9271319fff9c3f163f7f1c9160ff96b8fc64
font_01_sfnt_off0000fc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 10968 bytes
SHA-256: 019d0ece460e4653080a4b21cc321cdcad723a53be468754f1130398027c74f0