Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3249a4bcbdd918…

MALICIOUS

PDF

277.9 KB Created: 2021-02-04 08:55:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0db24f730ec152389fadc72fae8810f0 SHA-1: 28508f633b2b53ef572187f29cbb2d427fb8afba SHA-256: cb3249a4bcbdd918b218735e67caa2713f18b25900391f96ba2d6867d5292b61
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple suspicious URLs, with one specifically noted as an invisible link designed to lure the user into downloading a malicious PDF. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9830

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
  • 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.
  • 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/aws?utm_term=lodash+template+foreach PDF link annotation
    • http://radanews.site/disney_castaway_cay_map8v2t2.pdfIn PDF document text
    • http://winnerslm.space/19108841199ijmmq.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/RsgijTW/4896583483.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/ijdxhbk/b._o._t_full_form_in_electrical.pdfIn PDF document text
    • http://soul-felt.com/39372838619vwmwy.pdfIn PDF document text
    • http://shmelev.pro/man_down_lyrics_shakka1fb04.pdfIn PDF document text
    • http://com-login8.xyz/zusoza0ddzs.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/c6NigkX/fetevixono.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490001/normal_5fcb684a45584.pdfIn PDF document text
    • http://idealicacolumbia.site/46834796082d2oj4.pdfIn PDF document text
    • http://herss.space/fundamentals_of_business_administration_and_managementdtkwd.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/wbDzLih/tifamegitewegorutu.pdfIn PDF document text
    • https://cdn.sqhk.co/kozuvurop/QsjbhiZ/87896371984.pdfIn PDF document text
    • https://cdn.sqhk.co/xumifutave/gj5WYWN/house_flipper_dlc_ps4_release_date.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/piwanisaj/91559765671.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/manual_bottle_filling_machine_india.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/28989158639.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_off000402fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x402FB 5336 bytes
SHA-256: c9f1c51a56b36dcf5761d5c9aae31bd73b9d9ccded5eeba3f958140e822866d3
font_01_sfnt_off000414fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x414FB 16392 bytes
SHA-256: 92d547252303aa4d22da57b661dad45fdc517640ace8dcca071eb2f469d2ecb1

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