Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d49bbffcc9df513…

MALICIOUS

PDF

78.3 KB Created: 2021-06-01 10:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 088f2eaa95cfd9c7abd7e66a6cf8e427 SHA-1: dfeac9b8a003bb87cb78c20b38caa7e22d0118f5 SHA-256: 3d49bbffcc9df513e2534cc4f2956bf659c22cbe2905104e8dff4553e57e4a14
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 0.9964

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://wastran.ru/pbw?utm_term=how+to+cope+with+complex+ptsd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423750/normal_606769042eff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_601936217ea66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_604eb1d3d9dd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376870/normal_5fcc70bcacfe7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403822/normal_60093ff9f1bb4.pdfIn PDF document text
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/wuvozid-zonejadaf-niwirew.pdfIn PDF document text
    • https://namewedopuso.weebly.com/uploads/1/3/4/5/134583017/lokitevi.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4488116/normal_60b194adbe13e.pdfIn PDF document text
    • https://valofapapedor.weebly.com/uploads/1/3/1/1/131164243/d3715f23130471.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413117/normal_5fec1e5980ce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499995/normal_60368c8c78bf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_6061d03886399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529087/normal_600ff51a6ef69.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4416151/normal_60b4508593f6d.pdfIn PDF document text
    • https://vizudenorip.weebly.com/uploads/1/3/4/6/134674315/8422635.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473039/normal_5fdc9e8d4cbda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450731/normal_5fd2f57c6e630.pdfIn PDF document text
    • https://benubusu.weebly.com/uploads/1/3/4/5/134577078/xumonitise_zuwezexas_jixifunigiravi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_600aa91b8999f.pdfIn PDF document text
    • https://bewarovawizijus.weebly.com/uploads/1/3/4/4/134454629/8a50a0ef3b1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454281/normal_5fe9b68f85a79.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/88d48c55-762c-421a-a523-235e0a77c36f/ferdinando_el_toro_pelicula_1938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755098cb-4bf0-479f-aa6e-69190f1abf63/dunkin_donuts_large_iced_mocha_latte_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7deca5-f68c-414f-956d-1c87e1bc0eb8/dell_t5500_motherboard_layout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ed3c411-e1bc-4b99-a6b4-9e1d9ea52efd/94382941614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68726cbe-fb87-497e-9c8b-e8d611bb9481/15870156660.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_off0000f73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 5128 bytes
SHA-256: 24751c133f3691fdf6e71f975db0c7144edbe2c028d80d276d1bc5f06d6ad185
font_01_sfnt_off000108a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A0 10152 bytes
SHA-256: 9b203e138415cf052b734dafe788ad173529c244af55e9c7ac40bb3a3a64870b