Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bca706e5aa1c9e4…

MALICIOUS

PDF

75.0 KB Created: 2021-06-02 12:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4550ff751b83d5e36c49391f89ee36a8 SHA-1: fff5691553fe9fa7ecaaf87664c2fb80aeaf94be SHA-256: 2bca706e5aa1c9e4d336901b0f76520551464d14dbe8b2f4a52f2f937c174d4b
186 Risk Score

Malware Insights

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

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 0.9997

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://allytemp.ru/pbw?utm_term=what+does+call+not+answered+mean+on+whatsapp PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495681/normal_5ffca11dae075.pdfIn PDF document text
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/468990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417426/normal_5fda90571aa47.pdfIn PDF document text
    • https://tagaxaxe.weebly.com/uploads/1/3/5/3/135390661/vexodomumav.pdfIn PDF document text
    • https://zigakenipipoto.weebly.com/uploads/1/3/4/1/134131781/23498bb7b73ddcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_604f590a0d768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_605f27b80e902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_603f72cd0ea68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418972/normal_5fee6a12be816.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/ac63a85b-10fb-41ae-8da2-81f63e3ec679/26047699323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df4b9d4-b5fa-458b-87db-e7bc488aeeb1/how_to_clean_bissell_proheat_2x_pet_pro.pdfIn PDF document text
    • http://sokulus.pbworks.com/w/file/fetch/144479460/what_is_job_safety_analysis.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/84722454012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab78e314-ee33-4e83-b948-54e07da89182/area_formulas_for_all_3d_shapes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb9b2d17-533e-40c7-8824-2ddc20ca2722/79659504843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc6bbe34-c539-46d6-b759-d2ce6cd39384/interpersonal_communication_everyday_encounters_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b86d5fb-16df-4cc3-8a9c-fa9883aaed46/what_are_the_key_concepts_of_strategic_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/192f580f-649c-4d6e-8022-63784bbbc294/what_does_mediation_mean_in_media_studies.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/lezuxabisifoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead2a49a-b5f9-4f54-b08b-d449f163d126/dibujos_de_los_medios_de_transporte_para_colorear_e_imprimir.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_off0000db2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 5156 bytes
SHA-256: 5f52b699b5da01b9bf58f8a2d1dbe72172fc608deb4347081d4b19ba96f94b8b
font_01_sfnt_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 10396 bytes
SHA-256: c2c29cdd671f37e05a27f87b3f2350c2867307f1c9ca0ed35b8eeca4bd031e82
font_02_sfnt_off00011045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230