Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9b9afd1caada81…

MALICIOUS

PDF

84.6 KB Created: 2021-05-16 02:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: dc097c6c876ac9bb4aea42092e3b1892 SHA-1: 40bfd2816107e5fcbf88d222f749af4dbef1f0f8 SHA-256: fa9b9afd1caada81f49bae0e024e6f72033eb61c442a179d644181d7645cbb9e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm intended to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as Pdf.Phishing.Trojan. No scripts were extracted, but the PDF structure and URL analysis point towards a phishing or malware distribution campaign. The primary IOC is the suspicious URL used in the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=easy+cold+bow+tie+pasta+recipes PDF link annotation
    • https://cdn.sqhk.co/linidivez/HVYbjih/zololozogofubolatewom.pdfIn PDF document text
    • https://jijejadu.weebly.com/uploads/1/3/2/6/132683218/c40af6def.pdfIn PDF document text
    • https://cdn.sqhk.co/feneradebeza/SsBjf4x/my_dolphin_show_6.pdfIn PDF document text
    • https://cdn.sqhk.co/boxewemutox/ghDyjbA/tiny_rails_mod_apk_2._9._29.pdfIn PDF document text
    • https://cdn.sqhk.co/sevidekepige/iha8syQ/37139961307.pdfIn PDF document text
    • https://cdn.sqhk.co/kugoxepif/ibjayqy/kewisubuxaba.pdfIn PDF document text
    • https://wuremuzagatixob.weebly.com/uploads/1/3/4/6/134612401/141290.pdfIn PDF document text
    • https://mefupawex.weebly.com/uploads/1/3/4/3/134317460/nutikakogumud_ketovag_dakokesofup.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/4709eafafcee5.pdfIn PDF document text
    • https://cdn.sqhk.co/zitiwofiru/ijOjjr9/dish_anywhere_app_for_windows_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f95fac8-b0bb-4161-9e33-c7a3898b5603/project_scope_statement_pmi_template.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_5643e3cfa10f47f9956332546665efa5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce6407ef-cb9a-46dd-922d-7a7a611f1ff8/how_to_use_a_hair_dye_brush_dryer.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_c1ba53c68983431f84f45e3253126c2f.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_e3d40855f89a45aca39000b1645f2f4c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e77756b7-6ac8-4e37-a560-957fa2febb76/3946436445.pdfIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_3733a767c6324e4f91b8f4aabc87c639.pdf?index=trueIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_7aeff59902f340438cdef41731db5c0b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a7d039f-6c51-4e1a-92aa-d6261a19c1eb/bebakixabamipajurekiko.pdfIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_24d33b85e1c44f008ae0bd3ff4ffe54e.pdf?index=trueIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_90fdd505b84a4021a16f57aa7f381ab8.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_cf4d6a939c7f474d87257ff0dfcd9c39.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_150b89bf4a43493e9f5c1c9be8c08eb3.pdf?index=trueIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_8855595cd71543d7a76ed4efb20359ba.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_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 5360 bytes
SHA-256: c9e847c9d47e215fade26347f16ec408d752179e91e9f043694ee8ca2bf9c168
font_01_sfnt_off00011ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD9 11716 bytes
SHA-256: 42c97fc001b892031b0209dc8ec926a3032a7c68befa8f7ac50a826621f34de2

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