Malicious PDF — malware analysis report

Static analysis result for SHA-256 b901a4e308a71add…

MALICIOUS

PDF

67.6 KB Created: 2021-05-29 18:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c43b9ff566580a816eb126f97f162788 SHA-1: 2244670e70543e5e499b4676e78613e6a46564fc SHA-256: b901a4e308a71add0a0df8df8c26e15c94b02bed9db5c15cb4639ed67f3b57fe
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://vilenefex.ru/123?utm_term=english+worksheets+for+year+2+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370764/normal_603351e09cbe3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474220/normal_5fe2877f0815c.pdfIn PDF document text
    • https://xipidutaz.weebly.com/uploads/1/3/4/4/134401361/wibosupatuxefa-tebol-mubokupo-wajatad.pdfIn PDF document text
    • https://wuxelulomevadi.weebly.com/uploads/1/3/4/9/134904547/bekuxini-mujapuzugujose-limobijug-janire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408001/normal_604e383183277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381980/normal_6031b6a69de9d.pdfIn PDF document text
    • https://zixudepapu.weebly.com/uploads/1/3/2/3/132303172/kuvig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495974/normal_5fdf50dfd7fb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_602213d9d5b1a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4371010/normal_60affb96e8cf6.pdfIn PDF document text
    • https://zegepami.weebly.com/uploads/1/3/0/8/130874110/tuwabi_jokut.pdfIn PDF document text
    • https://lutitisuputusi.weebly.com/uploads/1/3/1/4/131437948/lenowiriga_guzelu_puxabopolavo_wozogebetaket.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_604f1f1979d3a.pdfIn PDF document text
    • https://xogofodaromaf.weebly.com/uploads/1/3/4/3/134387758/9340569.pdfIn PDF document text
    • https://dubujede.weebly.com/uploads/1/3/4/6/134607356/xuxewe_ratukemise_mudanilotisulez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484356/normal_60545ffde430c.pdfIn PDF document text
    • https://jezukiporewuge.weebly.com/uploads/1/3/4/6/134649506/xuzaves.pdfIn PDF document text
    • https://tejukazirinari.weebly.com/uploads/1/3/1/3/131398521/22659c41492ca.pdfIn PDF document text
    • https://fuwelobuzade.weebly.com/uploads/1/3/4/6/134649994/611489.pdfIn PDF document text
    • https://kuvakikarubefi.weebly.com/uploads/1/3/1/3/131383404/musax_nedeliwutun_momeni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415322/normal_5ffd31cfe0fc1.pdfIn PDF document text
    • https://pebifabo.weebly.com/uploads/1/3/4/8/134892867/jonivekem-kuzivepojovapu-xovow.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_off0000cdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBA 5648 bytes
SHA-256: 39398fa24c478cd47d1d546dd6625bf3340d592292f19c77cffa1ebfa968237d
font_01_sfnt_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 9428 bytes
SHA-256: 8b0ed3158718c4dd3d06bb912af3d60807a1d275acd8721c78bf446e3e616136