Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dce0755f4c96830…

MALICIOUS

PDF

84.0 KB Created: 2021-06-03 17:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 35de33851ee83baf255a354254bcd271 SHA-1: 71828f1f7fff2f47323bc3f92a120dd7bc6207ef SHA-256: 0dce0755f4c96830e2d2aa5c1f1ceb0c5f6266051ce1d531ef6708a7321b8101
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 0.9970

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://crysiq.ru/pbw?utm_term=fire+emblem+warriors+weapon+attributes+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471958/normal_5fd0d6397901e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_6026a739e71ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449766/normal_600910f7aaf97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369768/normal_5feb9dafc6dca.pdfIn PDF document text
    • https://lasajazog.weebly.com/uploads/1/3/4/8/134885140/5858170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470835/normal_605214ee95f13.pdfIn PDF document text
    • https://mejidoxele.weebly.com/uploads/1/3/4/3/134320803/2548884.pdfIn PDF document text
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/2733423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_602d711405c99.pdfIn PDF document text
    • https://kawolusasemosu.weebly.com/uploads/1/3/5/3/135397741/a250eb2601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_60b84129c3eae.pdfIn PDF document text
    • https://xolesozetenosox.weebly.com/uploads/1/3/1/0/131070434/1247739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_60663baecf579.pdfIn PDF document text
    • https://doxuginuf.weebly.com/uploads/1/3/5/3/135346615/6885a5cbe19dd61.pdfIn PDF document text
    • https://zexosupalagal.weebly.com/uploads/1/3/4/8/134887224/b4be79427c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478685/normal_6068464a7c6e7.pdfIn PDF document text
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/286ce59e5e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416131/normal_60122e645b1d0.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/862303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_6014a1f0bdde2.pdfIn PDF document text
    • https://rutisipileriruk.weebly.com/uploads/1/3/2/7/132740940/jasat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382966/normal_5fedd2c8c7f6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481282/normal_6023ee4da1b46.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/6c8f5c11-db2b-4617-b74d-a905f2b0c516/86569608047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8c52a8-efd0-4e85-857c-e9e6d1069f98/la_metamorfosis_libros_parecidos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3e9890-8d4c-402e-87f3-03cbccdecd1a/tikalarujidegewefole.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 5468 bytes
SHA-256: 0072f13ce6a33173e6efe4a133bb447dcfe8e45b0351634fa65b61ec4f966354
font_01_sfnt_off00011a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0D 11876 bytes
SHA-256: fa5cb1966c70877e44e3cace7b5b0d878f67acf386aaec8dd13af9cedaaa649a