Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad6bd66b361f4e5…

MALICIOUS

PDF

67.1 KB Created: 2021-02-16 10:01:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c068ecc714cada386cc1d4e619a3a755 SHA-1: 53eaada849e48c375b89015dce3fa3c57022d525 SHA-256: 2ad6bd66b361f4e58fcb67df6ec3e2e9fa06aaeee6ec55dbfe4f25bc08386fa6
166 Risk Score

Malware Insights

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

This PDF document contains multiple heuristics indicating malicious intent, including suspicious links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest it is a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it may be a generated document designed to appear legitimate while hosting malicious links.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://baarspo.ru/strik?utm_term=how+much+should+it+cost+to+replace+a+head+gasket PDF link annotation
    • http://sayseedokg.com/toladinetegoneturw5bh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_600bb2dfb76db.pdfIn PDF document text
    • http://lnstagram-support.live/gopelijavet26vu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_60223dfad75c4.pdfIn PDF document text
    • https://jazediwugitali.weebly.com/uploads/1/3/4/7/134730671/7507918.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/jARjdKr/creare_sticker_da_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454281/normal_5ffbad538af69.pdfIn PDF document text
    • https://wofexajolevesi.weebly.com/uploads/1/3/5/3/135302186/529747.pdfIn PDF document text
    • https://cdn.sqhk.co/figesuweno/EjiXjfa/1206968130.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/RSgch3t/taming_master_novel_epub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_60155397c9641.pdfIn PDF document text
    • https://wixumiwob.weebly.com/uploads/1/3/0/7/130776296/1873568.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/brondell_swash_800_manual93e1u.pdfIn PDF document text
    • https://tewawabuse.weebly.com/uploads/1/3/1/4/131437503/0d30c6dd4aa10f.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_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 5604 bytes
SHA-256: b95439364d0f7d6c84f24b38e5c590763cc29873a6c98edf45df935e9efb850c
font_01_sfnt_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 9892 bytes
SHA-256: 373313fdde8b59bafeaaa1df57770d7ad30bf938c7ba2d7eee73a79de936332d

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