Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a335df458cfd95…

MALICIOUS

PDF

79.1 KB Created: 2021-02-28 03:03:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e95e148bd79c8db2573edea3a97f67c3 SHA-1: d87ba5003193c9c7e0e95d621b437842cfbe72a4 SHA-256: 10a335df458cfd95aeec9859ae8a8d063835565e90538e2f9b80f519ecbb0810
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=que+es+distribucion+normal PDF link annotation
    • http://dalkomis.website/58976137541o2jwx.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/5e89d.pdfIn PDF document text
    • http://ellmax-site.xyz/31449920364mmfxc.pdfIn PDF document text
    • http://wumorumomu.22web.org/tevifoxole.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/63760473272.pdfIn PDF document text
    • https://xororawezajeber.weebly.com/uploads/1/3/5/3/135338150/6711890.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/jirotekerorowatuzideb.pdfIn PDF document text
    • http://mamajan.space/pediatric_surviving_sepsis_guidelinesphbrm.pdfIn PDF document text
    • http://bofinaposo.iblogger.org/86932171212.pdfIn PDF document text
    • http://omynutural.space/michel_foucault_madness_and_civilizationz7xvb.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/zte_warp_elite_wont_turn_on.pdfIn PDF document text
    • http://iuts.space/49682554549pyo8f.pdfIn PDF document text
    • http://bigtittybella.com/95123746265ps52x.pdfIn PDF document text
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/nixaxapa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://veveliwuw.rf.gd/driver_exam_test_answers.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_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 5288 bytes
SHA-256: 8e5cbda398f5229bacff45807b5548400d7286493834561db814efb757a63b9c
font_01_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 11740 bytes
SHA-256: 3f0873fba53ca5829afdc91b4562fa178416ee17dd47790ebc53aed3cb3903df

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