Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1c7d21372f34ae…

MALICIOUS

PDF

61.5 KB Created: 2021-01-29 20:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 75bda700b8bb2ab0ad552104feb0186e SHA-1: d091d6550dcd01ee5eef4464d68572b258ef5a26 SHA-256: 6a1c7d21372f34aef3e57acd771f3c7a85d7a9403b2cca3b666bc2629ee7750c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit users by directing them to malicious sites.

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://jottigo.ru/123?utm_term=holt+mcdougal+pre+algebra+workbook+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366325/normal_601319d7912b5.pdfIn PDF document text
    • http://leopards.space/nhl_standings_2018x9iso.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/Bhfgjjj/cthulhu_death_may_die_rules.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_600a481674012.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422373/normal_5ff0dccd79c61.pdfIn PDF document text
    • https://defiduzumuxel.weebly.com/uploads/1/3/2/6/132682342/dorajed.pdfIn PDF document text
    • https://biwoponafi.weebly.com/uploads/1/3/4/7/134767969/9404138.pdfIn PDF document text
    • http://daating19.site/truc_de_grand_mere_contre_la_toux70ccq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379234/normal_5fdff8ac5ec3c.pdfIn PDF document text
    • http://wordwild-store.com/69386632409wjcyc.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/j5iagih/favokotokitopuv.pdfIn PDF document text
    • http://antonioit.space/66334909868fjttx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_5fe80650ab12a.pdfIn PDF document text
    • https://tabekemaw.weebly.com/uploads/1/3/0/8/130874329/7960575.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425214/normal_5fe044fb645c4.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_off0000b604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB604 5652 bytes
SHA-256: bbc9e283ec702d4e6f44424d7dca6daf70510e1586960b0c4b6dad59192ce6cb
font_01_sfnt_off0000c928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC928 9412 bytes
SHA-256: a829a578cc54ec479b693387fb4f32ae5d8f786ae9cf66b1e5648bd436d39c07

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