Malicious PDF — malware analysis report

Static analysis result for SHA-256 4285fbd9aa26402a…

MALICIOUS

PDF

73.3 KB Created: 2021-05-13 08:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 865455f0e96825b856dbcab2421164db SHA-1: eb993f7834f40a0e924041e38102b33917bf8bee SHA-256: 4285fbd9aa26402a2c8402f87a89f9fd12f94ee8bfb0b16aa750dc729a5328b1
186 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=dunkin+doughnuts+nutrition+pdf PDF link annotation
    • http://subfamjtii.site/what_is_the_best_top_loader_washing_machine_to_buy_in_australiak8lmr.pdfIn PDF document text
    • http://mizarofu.22web.org/injury_report_patriots_texans.pdfIn PDF document text
    • http://summ-green.fun/predator_prey_simulation_labqb4ti.pdfIn PDF document text
    • http://gladkoe-telo.xyz/tameresigisosiu1ugo.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/commercial_vehicle_inspection_report_formyojad.pdfIn PDF document text
    • http://hangzhoumetal.ru/melikeniwoviidts0.pdfIn PDF document text
    • http://barbanapoli.moscow/blitz_brigade_gameplay_androidueyr3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_4a6efe90038a465382ec545926e2f96c.pdf?index=trueIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_dc7e54c99b3642e9a4d8449f3fcf62c9.pdf?index=trueIn PDF document text
    • https://316b94d8-f1eb-4552-9621-e6dada6029ed.filesusr.com/ugd/4b675a_6ca2566e10d6412ebff5bd1f9615d68a.pdf?index=trueIn PDF document text
    • https://62619d47-812b-4c4f-a232-aa08d86264e8.filesusr.com/ugd/6d62c1_701cb90c6dd647dd92adb77e3ebab193.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b92627-1df2-48c9-8e6d-9c93d1016875/karuvizijebibijem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b7f70a0-65c0-447c-bbee-609cd011b44e/xukupafagaxalerat.pdfIn PDF document text
    • http://tuwesexo.epizy.com/the_secret_life_of_plants_dvd_david_attenborough.pdfIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_a378161a55dc435eae1cf7a7d88af997.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93431aca-b903-4f65-9d7f-3f25a1d146f3/significado_de_soar_caminando_en_agua_sucia.pdfIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_c13e1ffbb12545828b2e9f15ca6c7dc2.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_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 5124 bytes
SHA-256: f80c55a241bcbcc2e71f65ead6d90dd0ab870a133e11cc313e418ae1dbe8e7c2
font_01_sfnt_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 11084 bytes
SHA-256: e33f42eb165692e6e5bbec7e3a4952023d0f5429e075fbff642b03cfd307b838

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