Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb0a1e4305a3c33…

MALICIOUS

PDF

80.4 KB Created: 2021-03-14 22:23:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 015112bce9b216b98f7b3ca175e14978 SHA-1: f8ad41a4b84fd0ecc5490511169af6928f4c6c53 SHA-256: 4bb0a1e4305a3c33305ef55e5eb5acd7028ba2eb290a36e366e9877490a1d5b2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests a social-engineering attempt to trick the user into installing malicious software or providing credentials. The embedded URLs point to disposable hosting and link farms, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://vilenefex.ru/wix?keyword=ai+applications+fall+into+two+categories PDF link annotation
    • https://jofufibiwew.weebly.com/uploads/1/3/5/3/135347649/2e0355302eed2a8.pdfIn PDF document text
    • http://botavubapisod.mywebcommunity.org/dungeons_and_dragons_online_tips_for_beginners.pdfIn PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/niwosaped-milorofaxigi-kogekerevokonup-toruwetuboxil.pdfIn PDF document text
    • http://mavaxur.mywebcommunity.org/72101797326.pdfIn PDF document text
    • https://ruxesewafemowur.weebly.com/uploads/1/3/4/7/134761388/9378033.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/bd167e98.pdfIn PDF document text
    • http://vinorama.fun/causal_analysis_essayyqlqv.pdfIn PDF document text
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/mewoma-penemodiri-notiwulonadaso.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/what_astrological_sign_is_november_22.pdfIn PDF document text
    • http://sberpodarok2020.online/duel_links_red_eyes_deckmwfdw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gesipimo.rf.gd/define_discontinuous_innovation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60347913-e605-4528-bb84-d2dc02fa087e/what_is_the_concept_of_nuclear_deterrence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84cb3d9-e49c-43c4-9e9a-15fe4844b975/ejercicios_de_comprension_lectora_para_primer_grado-primaria.pdfIn PDF document text
    • http://pulilubanis.rf.gd/63717337712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d258d7-bc5a-4463-831c-30c2ca9dbbfa/paraphrasing_is_an_example_of_which_active_listening_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1645e7e3-4d27-4091-992b-a25de0c88dfa/whirlpool_quiet_partner_1_heating_element.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/minority_report_dual_audio_480p_khatrimaza.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/zinufakusuxemigemunukura.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_off0000fdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAC 5264 bytes
SHA-256: fa005ed8a11c0d368e1f1c36e92ae95c20662e7536d78cc635985483b37e37d8
font_01_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 10772 bytes
SHA-256: 0004ebe23931456ce8b0724e276caf4952e3aaa0083a23607117f6cc32ecaa4b

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