Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6bfcf1e919fbf5…

MALICIOUS

PDF

74.7 KB Created: 2021-02-27 11:50:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 960d457f4a68198b8ac416b2c1db8d3f SHA-1: 11b700f696c53472ef8f99e40b19463a3cd8d5ae SHA-256: dd6bfcf1e919fbf503ac5ee75ff79db8a710dfd484ec4c3022a92593c7122bb0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://seumenha.ru/aws?utm_term=poulan+chainsaw+maintenance+kit PDF link annotation
    • https://xifupanudolegu.weebly.com/uploads/1/3/1/1/131164204/vixujorewuvezilobet.pdfIn PDF document text
    • https://cdn.sqhk.co/mekerijiwuv/gidTjcW/85139061867.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388163/normal_5fdfdff4e956f.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/oral_b_triumph_professional_care_toothbrush_heads.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498997/normal_600be47726cb8.pdfIn PDF document text
    • https://zitozujenuzudip.weebly.com/uploads/1/3/4/0/134042901/telebizad.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/posufij/3_month_calendar_on_one_page_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/91254460522.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/67630341575.pdfIn PDF document text
    • http://lidesesepaz.rf.gd/nopawimokene.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/logo_design_brief_template.pdfIn PDF document text
    • http://kimejuj.rf.gd/fawazi.pdfIn PDF document text
    • http://fexewagesulel.epizy.com/alveoli_gas_exchange_worksheet.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_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 5100 bytes
SHA-256: 4e553d5b3e4c4b458139569264f2381e0f7dbb5d8735b8d638ea83e0c75d7f47
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 10964 bytes
SHA-256: 6bf1381c472c60ba2ee4148dd51235b0d89ea63021de3f55a328f067ed4b49cd

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