Malicious PDF — malware analysis report

Static analysis result for SHA-256 00aa52e44e22ee8e…

MALICIOUS

PDF

70.6 KB Created: 2021-01-17 20:48:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 841000da253a722298a3556e556846ae SHA-1: 1dc00a895d61715e9a8bdd382008521a5c27f720 SHA-256: 00aa52e44e22ee8eb509ae81e582d5d8820a01c6f885ccb8ea02caefaa899f95
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 hosting and employing UTM parameters, indicative of a link farm or phishing campaign. 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 embedded URIs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=guardians+of+the+galaxy+ride+news+reporter PDF link annotation
    • https://site-1248608.mozfiles.com/files/1248608/gozinowifuwunowa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454302/normal_600260f5142d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495399/normal_5fec55575dfe6.pdfIn PDF document text
    • https://site-1178182.mozfiles.com/files/1178182/28895381951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389576/normal_5fd3943538d3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_5feaefae156fb.pdfIn PDF document text
    • http://lezapogogaz.iblogger.org/23586089311.pdfIn PDF document text
    • https://site-1173526.mozfiles.com/files/1173526/21220367046.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/ditiruz/zosirumo.pdfIn PDF document text
    • http://jilerixam.epizy.com/template_cv_word_gratis_bahasa_indonesia.pdfIn PDF document text
    • http://sosasofojatage.epizy.com/49495484868.pdfIn PDF document text
    • http://favukimasinete.rf.gd/taller_busqueda_activa_de_empleo.pdfIn PDF document text
    • http://palomidifigur.epizy.com/marepijefinakabava.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/philmont_scout_ranch_itineraries_2020.pdfIn PDF document text
    • http://petilawunabebi.epizy.com/psd_book_mockup_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/gutibumuxidini.pdfIn PDF document text
    • http://bopamebedozupux.epizy.com/99570930460.pdfIn PDF document text
    • http://nujexaraxeb.epizy.com/hmp_pentonville_inspection_report.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_off0000d5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DB 5596 bytes
SHA-256: af105431b611613c08cb1c2049ac1104d8c5d10aa0ec171cfc4fe8e18e047fee
font_01_sfnt_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 10512 bytes
SHA-256: 2570be89ad990bdfbd72a2899f06631ed4408c642cf4fdd217835060bdcd69e1

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