Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b2529beedb3443…

MALICIOUS

PDF

74.1 KB Created: 2021-03-04 11:13:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: afa80eb465d945bb182ae31bd197a4a8 SHA-1: f472c9fadb145bcc882dbb085de5ab0f4de72807 SHA-256: f2b2529beedb3443892d97929ee9f0d58f5174301cc395c50347dd6b720e2da5
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'activating nordictrack', likely a pretext to encourage link clicks. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/award?keyword=how+to+activate+nordictrack PDF link annotation
    • http://cashbackmoney.info/vitogilaporutegugekipewn8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470020/normal_600db43479b47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_5fea2aeae2a6c.pdfIn PDF document text
    • https://cdn.sqhk.co/nupegefozub/u5RXgcF/nugujaluvenegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489717/normal_602c41a7d525e.pdfIn PDF document text
    • http://realnoe-obshenie.online/pefolijijexaesbna.pdfIn PDF document text
    • http://com-signto2.xyz/aylesbury_high_school_sixth_form_open_eveningpmtm7.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/7heihjg/wiwarivunilurepijama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_5fe908a525ff4.pdfIn PDF document text
    • https://cdn.sqhk.co/bipozipo/gcigjcQ/siren_head_sounds_soundboard_unblocked.pdfIn PDF document text
    • http://apkweb.net/275239419526bqwd.pdfIn PDF document text
    • https://xuwukixirekut.weebly.com/uploads/1/3/5/9/135966502/716f85399fc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_6009c007830aa.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/somamere/apache_openoffice_impress.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_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 4900 bytes
SHA-256: ca06eee9ea10b38f6fe2b4b4d5b049453830af09dd31b5cc336917762530f714
font_01_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 10856 bytes
SHA-256: 834879648d013b726825e240e2dc512393a28f2e3c41510b0115cb20e7fe6c77

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