Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a00f2d59f3dd0f…

MALICIOUS

PDF

79.4 KB Created: 2021-03-28 08:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 108c0e891469d6015213673394733a25 SHA-1: 13733cef4999d225b5d0dbd9601ee679fb596b17 SHA-256: b3a00f2d59f3dd0faf1c875a3d038ad64b78233d7b67b6e129ddc32a90087dff
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/wix?keyword=brown+v.+kendall+summary PDF link annotation
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/28d9c01ba7a022d.pdfIn PDF document text
    • https://seguronudolag.weebly.com/uploads/1/3/4/4/134468074/rikuduvewi.pdfIn PDF document text
    • https://lutafutenitar.weebly.com/uploads/1/3/4/3/134381418/3bcf487d0ae.pdfIn PDF document text
    • https://rijadotijijani.weebly.com/uploads/1/3/4/4/134470018/3cb5c2f.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/giniren-vakisazuke.pdfIn PDF document text
    • https://nijumaweka.weebly.com/uploads/1/3/1/3/131379182/lenesoj.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/gogifamefijegitu.pdfIn PDF document text
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/387851.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/5bfb4c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_60171fba6f3b8.pdfIn PDF document text
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/xagolebujalurakemiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477877/normal_6039474c44747.pdfIn PDF document text
    • https://labaveboto.weebly.com/uploads/1/3/4/6/134611097/xexog_bewaniwavo.pdfIn PDF document text
    • https://kepemumud.weebly.com/uploads/1/3/1/4/131454984/4735d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_605ac8c34c4e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458616/normal_60142cb0528c6.pdfIn PDF document text
    • https://rofobanajogano.weebly.com/uploads/1/3/1/1/131164113/lozitis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453105/normal_6014484210a23.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/572bbfeb0.pdfIn PDF document text
    • https://disemorabegelam.weebly.com/uploads/1/3/1/3/131383982/wuporopofov.pdfIn PDF document text
    • https://rijifupipi.weebly.com/uploads/1/3/1/4/131453414/55389.pdfIn PDF document text
    • https://pabaxugu.weebly.com/uploads/1/3/2/6/132695470/negovotetupexa-vefoxana-wurosudadenupe.pdfIn PDF document text
    • https://mezamelakinates.weebly.com/uploads/1/3/5/3/135304028/mexejike_zinovuvivume_vugajafatedi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 5368 bytes
SHA-256: c99686437757449f2773b1cfd369690b92b5d0e2b72a3caf28b150751aef9c75
font_01_sfnt_off00010b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 10824 bytes
SHA-256: 4d1512a277017f5c913ed8d3034f6f3015a1ec8b47f7858e4928f557240a6f11