Malicious PDF — malware analysis report

Static analysis result for SHA-256 031011d20420fd37…

MALICIOUS

PDF

68.4 KB Created: 2021-05-30 05:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d53ad6d7e40a4ebd61c20abc12ce0431 SHA-1: c392eeccfe7f155d476844d5a594aa55fd3b6462 SHA-256: 031011d20420fd37548ea0fda83f1b382a6f96fec64b118493751f7874f070e3
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 0.9998

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://botokaw.ru/strik?utm_term=essentials+of+economics+9th+edition+mankiw PDF link annotation
    • https://dezekebewefe.weebly.com/uploads/1/3/4/7/134731304/kuwonuxok_texisodema_vejemas_kegonaluzez.pdfIn PDF document text
    • https://japarikadag.weebly.com/uploads/1/3/4/1/134108792/0e0db1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418783/normal_602eb76e4c5dd.pdfIn PDF document text
    • https://xufujume.weebly.com/uploads/1/3/4/8/134851049/fda9432f40.pdfIn PDF document text
    • https://mozufutedubido.weebly.com/uploads/1/3/4/5/134503110/75e442d.pdfIn PDF document text
    • https://fokatofevi.weebly.com/uploads/1/3/2/7/132712268/f49a6e.pdfIn PDF document text
    • https://fojanatixisi.weebly.com/uploads/1/3/4/2/134265346/telugi.pdfIn PDF document text
    • https://wesafave.weebly.com/uploads/1/3/4/3/134307961/ranejarexive-jufozidolata-gukoseforokila.pdfIn PDF document text
    • https://simamofot.weebly.com/uploads/1/3/3/9/133997368/wikaw_tadadabu_zoropepu.pdfIn PDF document text
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/3e38e8fcb9f78c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409243/normal_5fe73df9243c0.pdfIn PDF document text
    • https://muxalibozut.weebly.com/uploads/1/3/4/7/134718599/sisubejaxenev.pdfIn PDF document text
    • https://tuzebomutiwok.weebly.com/uploads/1/3/1/3/131398369/9899557.pdfIn PDF document text
    • https://wetebaxa.weebly.com/uploads/1/3/4/3/134343617/2915694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408866/normal_5fd88f6b6a53b.pdfIn PDF document text
    • https://luvupomadimudux.weebly.com/uploads/1/3/4/3/134350134/zuxuze.pdfIn PDF document text
    • https://tonikajolokoge.weebly.com/uploads/1/3/0/8/130874266/nunol_milewiwum_vujudepupesopew_bifadukewigire.pdfIn PDF document text
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/fccd3ec6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483346/normal_605e027ba9a79.pdfIn PDF document text
    • https://kejevupaju.weebly.com/uploads/1/3/0/8/130814576/mozutupu_xijipanut_bitoviluxuxes_rotute.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_off0000cd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 5432 bytes
SHA-256: 181b9719aaf72d53b9b0c28aad6bf01f1bbcc0348e486b874a84d5231c3bf4f4
font_01_sfnt_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 10716 bytes
SHA-256: 2f1b9279675a577fd4fd3c2e07f140893c729fb1a9289e2da5dec78793b335a8