Malicious PDF — malware analysis report

Static analysis result for SHA-256 190ad9c113320b7b…

MALICIOUS

PDF

74.0 KB Created: 2021-03-08 22:11:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d0777d5c084b0377ff59a4218ffee84e SHA-1: aca13c265edac9eab0abd1524595c5d3a6ea99b3 SHA-256: 190ad9c113320b7b5bf541a529e97add8d49b52dcae1f29bb171ab22404b04fa
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=kansas+agricultural+exemption+form PDF link annotation
    • https://cdn.sqhk.co/dutararopat/iGiaOKv/reading_worksheets_for_preschool.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5fd17cfad7e53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378848/normal_5fc87f43845ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450426/normal_6040fe743454b.pdfIn PDF document text
    • https://cdn.sqhk.co/jumosanex/lFibidn/liniliv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_603bc7add0c0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409256/normal_5fd966bf8f10a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_602c9e0dd1f6a.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/Jhdkdjb/la_times_crossword_puzzles_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462350/normal_5fcf893f5c935.pdfIn PDF document text
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/a4b60c938273ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417030/normal_5fd15aa41316e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490367/normal_603d42ecd3585.pdfIn PDF document text
    • https://lobixeximoruse.weebly.com/uploads/1/3/5/3/135319822/bijubijus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388046/normal_5ff25c6194f2d.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/5f1e7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_603713415c8c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_601e059f17364.pdfIn PDF document text
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/1893824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460966/normal_602462c82395d.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/7475b0ea-24cf-4f6f-b53d-214c18e9e54c/dowifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d7c2cc4-9dbb-4fe1-8520-01db97633605/13669818664.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_off0000e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 5372 bytes
SHA-256: 69c83e92fde49af174f3d89da3ca439cb88a7a2af458b9e7ffb19116c80c793f
font_01_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 10652 bytes
SHA-256: be4c5a8d498cb9bd310013a88588278b0550829c00bd5c6493b58d474cdff38e