Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef68550a69de27e3…

MALICIOUS

PDF

69.3 KB Created: 2021-03-18 03:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b89541e4b7595f305cee19d038695ef7 SHA-1: e790e763dace17320d1cba176a6488532916d660 SHA-256: ef68550a69de27e36950358c2f6499ba25e7dbd9b416e3baaaf766be9d27191b
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/wix?keyword=jayco+australia+owner%2527s+manual+pdf PDF link annotation
    • http://pivifemopore.22web.org/saskatchewan_boating_license_manual.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/3238658.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/zavolejuwerilin.pdfIn PDF document text
    • http://fulukegoror.getenjoyment.net/97970759433.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/xazuzoxasotijixekijabuvir.pdfIn PDF document text
    • http://smirno.life/98903503621ytzn8.pdfIn PDF document text
    • https://vexakoloninabi.weebly.com/uploads/1/3/4/8/134851928/24f91122e6cae.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/med_el_sonnet_listening_check.pdfIn PDF document text
    • http://1cats.space/rapelevazujikugolotzr.pdfIn PDF document text
    • https://kamedewogivazu.weebly.com/uploads/1/3/4/0/134096977/rikitipilit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_25c7c017206b44b7afb6aa02ffb24e6c.pdf?index=trueIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_7edbd9b53aec49b69bddbfcbb042400a.pdf?index=trueIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_b276162d104f48188aa529880fb3a80f.pdf?index=trueIn PDF document text
    • http://ruxuwidoke.epizy.com/simple_bootstrap_footer_template.pdfIn PDF document text
    • http://lomonogugala.epizy.com/66211584077.pdfIn PDF document text
    • https://8b62b971-d575-4461-ae89-9de7a2afac08.filesusr.com/ugd/c5a911_11fc567a0a894615b31129be82ac43ac.pdf?index=trueIn PDF document text
    • http://fekejuw.atwebpages.com/aitsl_standards_2020.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_e59f07d6f88844b08491973a6f442bd9.pdf?index=trueIn PDF document text
    • http://rewexukid.epizy.com/wususuduxiki.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_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 5520 bytes
SHA-256: a8933baf20b68f560dc6f9483b35aab3acfeb33c4a37c3a2f0219350da0833ce
font_01_sfnt_off0000e103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE103 10984 bytes
SHA-256: 30de50f0635c6121dc9de1402e31f2baa13f3c62b0f455c92769172419db3211

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