Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c82a38d248f9e02…

MALICIOUS

PDF

80.6 KB Created: 2021-04-25 19:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3c4fff9f5771bed8d79f6fef2f5fb88c SHA-1: cfdf5409895071effeace17299058efc9371faf4 SHA-256: 7c82a38d248f9e023f1efc5cd01e8241ea5a1ee0be3b2c40dc5bcd5550e14913
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a tactic of luring users to external malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/strik?utm_term=logitech+k400r+some+keys+not+working PDF link annotation
    • https://nobawevedidilut.weebly.com/uploads/1/3/1/3/131379382/1128793.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/anet_a8_marlin_configuration.h.pdfIn PDF document text
    • https://paxupodef.weebly.com/uploads/1/3/4/7/134763896/magofipopoti.pdfIn PDF document text
    • http://uscreditcheck.info/bevowavidugimaba7uqf.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/ejemplos_del_genero_lirico.pdfIn PDF document text
    • https://gebobofivogaxe.weebly.com/uploads/1/3/5/3/135308574/kogisuz-xupokikedoleve-siwom-pewode.pdfIn PDF document text
    • https://zegadakupoxak.weebly.com/uploads/1/3/4/7/134749069/fosudativenagagen.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/adobe_premiere_elements_2020_update_download.pdfIn PDF document text
    • http://ridaxaki.mywebcommunity.org/nebeduredobusupusava.pdfIn PDF document text
    • http://photoforce.ru/tutufominujelagiwe3eaw.pdfIn PDF document text
    • http://reactivaperu-2020.com/7225052336905ou5.pdfIn PDF document text
    • http://detonic-deutschland.website/sullivan_algebra_and_trigonometry_8th_edition98lcn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/77860364330.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/puwimita.pdfIn PDF document text
    • http://winixugerefubu.epizy.com/tamil_alphabets_pronunciation_in_english.pdfIn PDF document text
    • http://dopovis.myartsonline.com/who_is_nadya_in_the_tattooist_of_auschwitz.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/72244303871.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/the_rime_of_the_ancient_mariner_summary_part_5.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/hypoglycemia_newborn_guideline.pdfIn PDF document text
    • http://pupovedifa.rf.gd/illustrator_freeform_gradient.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/30372972543.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/archer_c20_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 5188 bytes
SHA-256: 92fa9d8d5fe70badb8be5deec3376184004b6a6b0d7b5d6d2abfa27da35d5ae2
font_01_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 11164 bytes
SHA-256: af0541954ce41ec07a346a41e44ffa696aba4d5ce94ca6683e8cf244ffcac104
font_02_sfnt_off000126c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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