Malicious PDF — malware analysis report

Static analysis result for SHA-256 505c96e46e11645e…

MALICIOUS

PDF

74.9 KB Created: 2021-03-16 07:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6a986eccda9830f76c4cb272bf4f3197 SHA-1: 9b82659a5ea61f2f3d9f31078263cb00ecb4bd78 SHA-256: 505c96e46e11645ea0af0b0479fb9d02baf8cdbf2b033911557e41970ecf1430
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 0.9992

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/aws?utm_term=polycom+vvx+410+phone+warning+icon PDF link annotation
    • http://pokavitapizinuv.iblogger.org/64727670265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467601/normal_6040e9982f0df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426062/normal_601816ef5730e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428329/normal_6009142b76f05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369302/normal_604169bdcb00c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478683/normal_5fd774ad59fce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_6016b6ff42bfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_60432b15d27f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465690/normal_5fe41782b8f19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_600dfb85279fd.pdfIn PDF document text
    • http://faketikus.22web.org/67426032788.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_0514e6da066f4e61a248502bc397e3bb.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_a0fe173bce15439faa37bcb7cd341397.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c37e2310-96a1-4da8-8567-53aa47328cfe/keurig_b150_replacement_parts.pdfIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_269f70b2af3f476cac10862629a280f0.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_33da4016f05c49e690a4b9550605ef5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbe2935d-bb88-4f17-ad60-f5e03acc9bea/baby_trend_expedition_double_jogging_stroller_accessories.pdfIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_731b60d6af5b423bb6cfc5f55979bc91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7abd441c-7796-4698-bc5f-215b1e8ade95/what_is_the_best_professional_facial_steamer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef77bc91-59d6-4e1a-b55a-8175eb52c951/plan_de_negocio_en_ingles_traduccion.pdfIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_8a1f449d9ca841399cfb39efcb21963b.pdf?index=trueIn PDF document text
    • http://gutazerabudapa.epizy.com/xalozafumijoxa.pdfIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_cc92ebf686d74d9aa0d48860c6a97bf9.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_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 5772 bytes
SHA-256: 257233731ccafc13058fd68e368043c1d0c330590c678224864205a8cd8e6bb1
font_01_sfnt_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 10956 bytes
SHA-256: 4817e9759242b8aac37a98f4347aed2123351d6b776fb5c15e9fd0147ffee827