Malicious PDF — malware analysis report

Static analysis result for SHA-256 615ffee0238769d3…

MALICIOUS

PDF

73.5 KB Created: 2021-05-19 07:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 69837c0d0fb20d766a2d9cded06c9f34 SHA-1: cd31381a53b01cdf2fefb32bd1fb7763af1a3ab2 SHA-256: 615ffee0238769d3aa1a3700a1ef7483f7a9b2fcd942f62f70c1497cddd72e67
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains an embedded URI and an image lure that redirects to the URL 'https://jumiwimov.ru/strik?utm_term=overnight+dexamethasone+suppression+test+explained', suggesting a phishing attempt to trick users into visiting a malicious site. The document body is heavily obfuscated and unreadable, but the presence of external links and the high confidence scores from security tools strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/strik?utm_term=overnight+dexamethasone+suppression+test+explained PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458407/normal_605981e175c6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454966/normal_60486399739c6.pdfIn PDF document text
    • http://kidepokapila.22web.org/67381823610.pdfIn PDF document text
    • http://nedopivele.22web.org/gewivalenogevemisofixot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_601ca5bd26d0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_60116225c464c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424026/normal_606c03c5228f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416790/normal_5ff21d70b5426.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/degisapemifa/xakarex.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/genetic_code_chart_worksheet.pdfIn PDF document text
    • http://jabaxuzadowepep.rf.gd/558780405.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/what_is_difference_between_honda_civic_ex_and_lx.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/nanavutanikuwemapumede.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/63560498561.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/varumopufuritirapero.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/jejatazelajozujesol.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/55258044587.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/what_is_bug_triage_in_software_testing.pdfIn PDF document text
    • http://vosikixu.rf.gd/counselling_adolescent_problems.pdfIn PDF document text
    • http://lewupidofiji.epizy.com/typing_practice_sheets_free.pdfIn PDF document text
    • http://dubixifixi.epizy.com/18755271300.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE1 5528 bytes
SHA-256: 0f87660690a3e612fc083a5297ff7b97794e9c4dcdd068789dd22eca795acb5f
font_01_sfnt_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 10292 bytes
SHA-256: c6fef0105f3d874d367c25fd1e1ce4ae996725a0a59c0e29c1a91587a28e4bba
font_02_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 16300 bytes
SHA-256: a2df089113492be1c216fedfedf3847638426ef332bd7996ffa83a8d14451346

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