Malicious PDF — malware analysis report

Static analysis result for SHA-256 e686f49520e184fa…

MALICIOUS

PDF

72.3 KB Created: 2021-02-24 03:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c59991f8b55e19f2fd32785ec9e87ac8 SHA-1: face1a09dfb815607909ae12b253cbd9a043e106 SHA-256: e686f49520e184fafe22c05855e061417f27073f18da88731db1d3ee37ff72c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=what%2527s+it+called+when+you+change+the+subject PDF link annotation
    • http://teleporttur.ru/722826637189sfos.pdfIn PDF document text
    • http://domensita.fun/85449384866lfny9.pdfIn PDF document text
    • http://lovemecompletely.com/wevenuzejexoxasavafqkphe.pdfIn PDF document text
    • https://vigusukababimer.weebly.com/uploads/1/3/4/8/134881512/6821061.pdfIn PDF document text
    • http://idealica-itufficiale.website/sonny_bono_death_helmetq93o8.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/wobidi-momewefa-lemudavazas-musipo.pdfIn PDF document text
    • http://itawomen.fun/tegotomerig1y81.pdfIn PDF document text
    • https://rolurenogilu.weebly.com/uploads/1/3/4/0/134096536/rimoxebokafemetanus.pdfIn PDF document text
    • http://cpatrump.com/batting_skills_in_cricketttfhr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/87800783338.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/3157439412.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/31053011252.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_off0000ddc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 5564 bytes
SHA-256: 46e2728f98f58062850b7d247468a7116a0a03e02a195a9b2bf7db977fc0e846
font_01_sfnt_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 10348 bytes
SHA-256: 505611bc0fd9a93fcf3c69f32084f5bca00feacf5f2d357f48366c7bffc2123f

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