Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dbb8d51ddf1943…

MALICIOUS

PDF

79.0 KB Created: 2021-05-18 07:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f92653f99e017f03eb39be0f3361a2b1 SHA-1: c31daba08c7b4a0dbba32ce59d3df73beec98799 SHA-256: b4dbb8d51ddf1943106b9de8add074b0e54d8c848b1e55d82944330f3058baf0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=how+to+get+a+new+food+stamp+card+in+oklahoma PDF link annotation
    • http://sazefakopek.iblogger.org/formlabs_castable_resin_curing.pdfIn PDF document text
    • http://zelebanibusoxu.iblogger.org/nageken.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451752/normal_600c46e1b8516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_603d529296be8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_602f131a99006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495838/normal_60608d0466391.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://uploads.strikinglycdn.com/files/4ab10112-3cd7-4f69-bdcf-e4420ce9d061/28749912347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e1dd8c-4d94-488c-8677-71a2ea360a1f/mawinojodoterak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa2eb63-f1f8-49c3-9865-29d367137733/kikesuvanorijasute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be115e1-5572-485f-b0dd-753c12be4f1e/calendario_mexico_2020_excel.pdfIn PDF document text
    • http://wifovofor.epizy.com/74068996385.pdfIn PDF document text
    • http://jodonurinifos.epizy.com/the_odyssey_book_9_summary_shmoop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f25388b-e889-4ddb-91ba-a2f97ce10b8a/apple_cider_vinegar_miracle_health_system_book.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/7508129827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afae0cd2-4ce7-409a-b3b6-7eacbf30d840/burger_king_breakfast_specials_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/wawomulad.pdfIn PDF document text
    • http://zikinevubebera.epizy.com/gta_5_mobile_android_aptoide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abf740f1-1d09-46f1-9613-851eb6fa340b/ziwimezikolubudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e18140-72ab-4fad-a873-c6836462b6db/dejozakigikivolepasasaxas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e90d2e7c-360c-4a13-a957-fb05efb7d3dc/how_to_calculate_distance_from_velocity_time_graph.pdfIn PDF document text
    • http://rotaduwifomol.rf.gd/calibre_for_android_tablet.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_off0000e884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 5472 bytes
SHA-256: 7bf69dfd28ceab623fbf8a670a3f0ecd02564709d5cbac0691eab41a0700adc1
font_01_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 10896 bytes
SHA-256: 80fba1f3c601aad7790faf14fe75f04be546600b255500cf506a62855dad468a
font_02_sfnt_off0001200d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e