Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2bfc780bdffc17…

MALICIOUS

PDF

70.5 KB Created: 2021-02-25 18:24:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 562cddf91a69491b56d5e61c22091082 SHA-1: c77fe61977de8b84921794692358d7a09eb305f3 SHA-256: ec2bfc780bdffc179bbdfd13e4c3998a19d4e80cbd2921f1f7c193873aeae158
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=cool+math+games+unblocked+66 PDF link annotation
    • https://tovijivesigaz.weebly.com/uploads/1/3/5/3/135327805/bijenezegeru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469863/normal_5fe2edf52345b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412895/normal_601091c1acd53.pdfIn PDF document text
    • http://tohld.in/what_is_the_storyline_behind_the_nutcracker_balletrvz5m.pdfIn PDF document text
    • http://gmetry.online/92163141722rz41o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5feb9f84d09ea.pdfIn PDF document text
    • https://takojozosuliwo.weebly.com/uploads/1/3/0/7/130739597/dakezokonuxejiw.pdfIn PDF document text
    • http://realwockyc.info/html5_annotationk0e9m.pdfIn PDF document text
    • http://fitit.space/30693770141vvh37.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/rotowan/fort_hood_shooting_2009_after_action_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/ceramic_cutting_tools.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/manualidades_con_palitos_de_helado_para_navidad.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_off0000d723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD723 5520 bytes
SHA-256: e7d858956a2d56437f8e0da80a17d122e5127e88b69b66c04413fc73db2b888a
font_01_sfnt_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 10500 bytes
SHA-256: c95631f73a9a15c067f60e9413cd1a713be82d6cadc57f41086bd5f8c0982783

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