Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98888a19b11da80…

MALICIOUS

PDF

81.7 KB Created: 2021-04-24 17:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 98345df1bb2fe8bebdccd15a6339127a SHA-1: 315f50aacc2df879a8680c0a6d5614a4a9d91256 SHA-256: d98888a19b11da8004b9fd4d394412af21f1d38ca92a8f2040c2f9b606e5e44d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to exploit users by directing them to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://seumenha.ru/strik?utm_term=tboi+four+souls+how+to+play PDF link annotation
    • http://suporefebakibur.mygamesonline.org/dinike.pdfIn PDF document text
    • https://rategojo.weebly.com/uploads/1/3/0/7/130739688/294de36c21656.pdfIn PDF document text
    • http://zonuvak.medianewsonline.com/autocad_software_download_free_for_windows.pdfIn PDF document text
    • http://zonokiwuwagupu.getenjoyment.net/95629645463.pdfIn PDF document text
    • http://finofubamu.mygamesonline.org/free_to_word_converter_software_online.pdfIn PDF document text
    • https://xegavepixax.weebly.com/uploads/1/3/1/4/131452872/xeduvipe-renidijewemep-fujezob-lereganaza.pdfIn PDF document text
    • http://lapiwudoxavov.scienceontheweb.net/english_conversation_practice_free_download.pdfIn PDF document text
    • https://jumirugefof.weebly.com/uploads/1/3/3/9/133997886/4323342.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/90583055911.pdfIn PDF document text
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_a8facbb682c9420998a06f2c534ded90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d3e74f-4936-43d0-abf0-f50910b00bd8/96144109359.pdfIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_b6f9de7fef504dfbab98ec072d9ee389.pdf?index=trueIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_a5b0c3e7584044ac94a85b5cfd67df89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d1eb1fb-d35e-4ee0-b669-281715fba21a/formato_de_analisis_de_riesgo_por_puesto_de_trabajo.pdfIn PDF document text
    • http://xakazasaravi.onlinewebshop.net/padilujepubeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca465b6-c293-4171-b10c-3cdb6a7d0d5c/honda_eu2000i_super_quiet_2000_watt_portable_generator.pdfIn PDF document text
    • http://firiwigisu.atwebpages.com/mathematics_attitude_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1001d18-fb80-40ab-a6db-33368fe93ee9/coleman_saluspa_inflatable_hot_tub_manual.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_664782d254e248d6861b37b2175d378f.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_4eb23f3aad504348b70195bd539099f2.pdf?index=trueIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_6d40432fc78c4e2ea737cecb6276e09b.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_fbdfed6fdc9b48a8805e86c8f905619f.pdf?index=trueIn 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_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 5272 bytes
SHA-256: 3f1644588e44df64b2018caa4a265761362646405691bba2feea5d9411a6c06a
font_01_sfnt_off0001111f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 11840 bytes
SHA-256: 4649256f3310c39449722d2deaf8256449099b88910ca928540ff234ad619690

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