Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a00590f70fe5972…

MALICIOUS

PDF

88.4 KB Created: 2021-03-04 16:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5edb7f9e465f905d222d5ae1c4a27f1c SHA-1: 1cc6be89bedce15afbd1c57c3c8adfed860eee4b SHA-256: 7a00590f70fe5972dd7a0c8719995f26a2adaccb8d4971d05cfe8857c2bf6e43
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/123?utm_term=how+to+program+a+comcast+remote+to+a+roku+tv PDF link annotation
    • http://vanimerukaguto.scienceontheweb.net/how_to_compare_two_artists.pdfIn PDF document text
    • https://mobesometug.weebly.com/uploads/1/3/4/6/134644263/jifomojuxavi.pdfIn PDF document text
    • https://pudesuvake.weebly.com/uploads/1/3/0/9/130969082/1473281.pdfIn PDF document text
    • http://zumofujej.iblogger.org/information_technology_project_manager_skills.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/2200995.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371240/normal_5ff95df2954d1.pdfIn PDF document text
    • http://zakomuxoza.getenjoyment.net/formato_de_avaluo_de_obras_de_arte.pdfIn PDF document text
    • https://zedasadexim.weebly.com/uploads/1/3/0/7/130775923/tolezuja-fovemamuwujik-towemulotoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fd6541eb0117.pdfIn PDF document text
    • http://delinapod.mypressonline.com/sony_xplod_10_inch_subwoofer_1100w_review.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/4_pics_1_word_level_2315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_603fc1b078edf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabenejajoko.myartsonline.com/gabaxeresite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/375fbf01-972e-4553-a18c-c755b425f874/how_to_do_data_analysis_in_python.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b96020-bc06-438f-9e38-a4cc2d2c3725/muvepiganofelolofej.pdfIn PDF document text
    • http://xutasiwewuzaf.rf.gd/delaware_state_police_incident_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e8b40f-40b0-442d-9f7d-e1d624859fe4/rowenta_steam_irons_on_sale.pdfIn PDF document text
    • http://vumamuv.myartsonline.com/bumoniwuwawezanis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6c6d71-c2db-473a-85bf-5e0fc95996c7/concord_hospital_building_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d28b231a-56b6-43da-8008-a28de902be5f/sateguwoximowuwewozipabiw.pdfIn PDF document text
    • http://wewixokadun.epizy.com/62886131781.pdfIn PDF document text
    • http://meladuk.rf.gd/78730426081.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_off00011aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEF 5400 bytes
SHA-256: ec2e9ee3487011f6e6f55ed54b76a074f6dad4ffb29524efac2351a43e625919
font_01_sfnt_off00012d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D52 11360 bytes
SHA-256: 4cb15a7286726f5fc30aeabe7257338ffb7e1b7ac88153e355d3633257017420