Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ac8ad7c3c1a56d…

MALICIOUS

PDF

83.8 KB Created: 2021-05-27 18:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 15d39c3e920e81913dfdb1773954b052 SHA-1: 74eeebff6b86f147bcb5f7d4bd433f8b1ef51e9e SHA-256: b0ac8ad7c3c1a56dae06d8e214a25b610e987e9e97aa0f3d6d066532264c5125
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 0.9996

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://xezojetit.ru/strik?utm_term=danza+folklorica+el+cerro+de+la+silla PDF link annotation
    • https://rivupabageram.weebly.com/uploads/1/3/5/3/135323939/butetotawatos-darujuturadipox-rokarobumoxet.pdfIn PDF document text
    • https://fafogefefotal.weebly.com/uploads/1/3/5/3/135314601/tesovamifu-miforafemekiwib-nifipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458388/normal_60491023881af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393889/normal_5fcd7ad1d1e60.pdfIn PDF document text
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/xusolutok.pdfIn PDF document text
    • https://wemavejuza.weebly.com/uploads/1/3/4/6/134689468/ad7909dc52.pdfIn PDF document text
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/vovirafera-wifosufosil-pawewosedu-jetifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459319/normal_601bd1845efdc.pdfIn PDF document text
    • https://xubebedi.weebly.com/uploads/1/3/0/7/130776367/tebiwinimesapakeje.pdfIn PDF document text
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/kopijaxobe.pdfIn PDF document text
    • https://tasufevijusenix.weebly.com/uploads/1/3/0/8/130814010/9636930.pdfIn PDF document text
    • https://kaxunuruji.weebly.com/uploads/1/3/4/7/134725802/3506460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_604cb6ee66ade.pdfIn PDF document text
    • https://zanewodibamejat.weebly.com/uploads/1/3/0/9/130969445/8184d468.pdfIn PDF document text
    • https://buvupoxiku.weebly.com/uploads/1/3/4/3/134329971/9a21e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_604a87e53a3e1.pdfIn PDF document text
    • https://tatamanigo.weebly.com/uploads/1/3/5/2/135299517/3127143.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 5128 bytes
SHA-256: 6129814868f0e5da71b22df2eccc2b01f017e29d39718ef480b09febac71076a
font_01_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 1936 bytes
SHA-256: 5037c8ce54743dd9c4ddb8dbe5d3f431e275c885654ef2f6f43a54a6e35c0c61
font_02_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 11836 bytes
SHA-256: 65fc146630b54d59760d6ea51816381e383cc14b7fc9c9b34d09dc6c06d113ac
font_03_sfnt_off00012a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5C 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140