Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d9b4a593a41b56…

MALICIOUS

PDF

74.7 KB Created: 2021-03-25 01:22:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 064abee32f947b6f1ff97add1ea6b81c SHA-1: 2689ab6684090614fb815d5e6a59753966e0ab95 SHA-256: 51d9b4a593a41b56beea9ddefa1de84c072d05181180a5f3bd3c7ba226e13b1a
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms and phishing. The 'SE_MFA_LURE' heuristic indicates the document likely attempts to harvest credentials or session tokens by mimicking a multi-factor authentication prompt. The presence of external URIs and the ML classification strongly suggest malicious intent, likely to redirect users to a phishing site or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://vilenefex.ru/strik?utm_term=liftmaster+41a5021-1h-315+remote
    • https://moninedowilex.weebly.com/uploads/1/3/1/4/131436981/nupivewug.pdf
    • https://cdn.sqhk.co/tezabulaw/jjhgcha/fusajerureronapafitura.pdf
    • http://reduslimitaly-ufficiale.site/om_shanti_oshana_with_english_subtityssug.pdf
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/1513471.pdf
    • https://cdn.sqhk.co/pesenexur/geiehaV/finibumujesitiseluzo.pdf
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/f8fa0c74d4.pdf
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdf
    • https://zuretajobujab.weebly.com/uploads/1/3/1/4/131483148/sefebeweruxabudurin.pdf
    • https://fomemavinujidi.weebly.com/uploads/1/3/1/4/131414297/b77e5e9e5b9.pdf
    • https://buwuwewofopalun.weebly.com/uploads/1/3/4/0/134097592/gataburabirowegoji.pdf
    • https://dabosimupit.weebly.com/uploads/1/3/5/3/135397997/5502726.pdf
    • https://cdn.sqhk.co/wosipuvetot/rhahd41/tiktok_news_today.pdf
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/silubodalevamu.pdf
    • http://buybritishcat.com/what_does_return_to_sender_processed_meanehb2s.pdf
    • https://cdn.sqhk.co/renosopezare/Sghevha/letterboxd_for_tv.pdf
    • http://callup.today/mywork_www_chc_netp594s.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gelawiweza/80572308675.pdf
    • https://s3.amazonaws.com/jejulurowev/charge_of_the_light_brigade_poem_form.pdf
    • https://s3.amazonaws.com/rirusozo/invitation_templates_psd_free.pdf
    • https://s3.amazonaws.com/tiluwisulepam/duwik.pdf
    • https://s3.amazonaws.com/xanunafojuloki/55479261004.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e346.bin
1928b32ddcb58c7db0434179ff8f0534c74b13a049f785361dde25af3e6d71f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 5648 bytes
font_01_sfnt_off0000f666.bin
27760c7b2358b8089c2c536e902b4c4ecd0f7b3308d93768b4a466b880dd847d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 11092 bytes

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