Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c1710dae1554fc…

MALICIOUS

PDF

71.8 KB Created: 2021-02-11 20:24:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d88b582a60cd5877e07506f4b7428d92 SHA-1: 8d696a20c327e2657abe1f2e3bdabe01c440a13e SHA-256: c9c1710dae1554fca1558ac2be4ab5bbb667007a43677aaf3f64c75354c7d04e
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URIs, with a primary one pointing to a phishing domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a link farm setup on disposable hosting, reinforcing the phishing lure. No scripts were extracted, but the embedded URIs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=pretty+little+liars+flawless+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482403/normal_5fce993b0b954.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/jeib4dC/27854885198.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/Mheijhd/mulozivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418984/normal_5fd635e221b52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_600a033b51c90.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/JhdM3iI/48351919771.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/bBgdjdX/60756341002.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/jhwgchc/we_tag_for_instagram_post.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426677/normal_600407e80a80f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477910/normal_6009c6a18c5a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384036/normal_600f2ac87bbfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_602552744effe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413240/normal_5fdc1b733ecb6.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/geOifDB/ffx2_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5fdb6efebb2df.pdfIn PDF document text
    • https://cdn.sqhk.co/keximovib/dijMsL5/65807193748.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/mexijegedakol/27533629554.pdfIn PDF document text
    • http://vufobaratoja.epizy.com/molecular_pathogenesis_of_cancer.pdfIn PDF document text
    • http://pikuvideposem.epizy.com/xaxipuzosotirodusojag.pdfIn PDF document text
    • http://gitipezusev.rf.gd/geophysical_research_letters_author_guide.pdfIn PDF document text
    • http://gelanuvefod.epizy.com/aditya_birla_sip_redemption_form.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_off0000dc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 5228 bytes
SHA-256: 13cd479db036d40ef3afa0892a0fb07dcc02ea9593416b6081a62846aff304b4
font_01_sfnt_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 10380 bytes
SHA-256: 36999662dddf59e24ba05e61f051e286c5dcb34af67c799b2e62f71d93237354

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