Malicious PDF — malware analysis report

Static analysis result for SHA-256 def6109777b3b2d6…

MALICIOUS

PDF

74.1 KB Created: 2021-03-25 06:54:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2308032a272bce573b34d50ea49bb76d SHA-1: 2a6441f633cdb838aa5dfc6f991bef67f17d4a15 SHA-256: def6109777b3b2d652a8e8a65c3539de6b6f17b3309a1e2040d34788ef6f16fa
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files hosted on Weebly, suggesting a link farm or redirection scheme. The document body is heavily obfuscated, but the presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://ponafet.ru/strik?utm_term=project+x+5.5+flex+vs+s300
    • https://ravuluzezufex.weebly.com/uploads/1/3/5/9/135956854/2928668.pdf
    • https://rikusinifo.weebly.com/uploads/1/3/4/0/134017093/mejilewoduw-lelidozozebuxu-sasane.pdf
    • https://xebolefijepipol.weebly.com/uploads/1/3/0/7/130739937/3542942.pdf
    • https://cdn-cms.f-static.net/uploads/4390074/normal_5fd5f07da5b52.pdf
    • https://kexejimeso.weebly.com/uploads/1/3/4/0/134096016/9781090.pdf
    • https://kebuwusatame.weebly.com/uploads/1/3/5/3/135343151/tokeki.pdf
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/kosutemilod-bajeb-vakurugu.pdf
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/migonigum-resawomi-bulagosikebojoz-gakavipudifi.pdf
    • https://balebapu.weebly.com/uploads/1/3/5/3/135322653/vumejaposebe_zazepiv.pdf
    • https://cdn-cms.f-static.net/uploads/4493266/normal_60421dae3a2e5.pdf
    • https://jejepijukutu.weebly.com/uploads/1/3/4/1/134131362/8bc346952226032.pdf
    • https://cdn-cms.f-static.net/uploads/4471099/normal_600c9bf21a29c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_9224a9dbddf649b185fc3cb71761849f.pdf?index=true
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_24b8d0b251534c37bacea802778b8a7a.pdf?index=true
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_51803b690cdf44d6902d5ec34b788e90.pdf?index=true
    • https://s3.amazonaws.com/papuja/breach_of_duty_notice_form_victoria.pdf
    • https://s3.amazonaws.com/wanalovum/rewegepoluvuvopuzukidako.pdf
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_053b66c6d0194825814dff48eb13c546.pdf?index=true
    • https://s3.amazonaws.com/jefobexapulow/1_1-_azobis_formamide.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_off0000e59d.bin
dd2b8b4950af34c858b528417372dcf5db6ababd251366f704d61ead2da6c500		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 5332 bytes
font_01_sfnt_off0000f7f1.bin
731d386cf21ebcb0d994ed888f06d3ee13e50b8b9f3ace1482ec49f36620c29c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 10348 bytes

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