Malicious PDF — malware analysis report

Static analysis result for SHA-256 7273e35f47a2ef1c…

MALICIOUS

PDF

84.9 KB Created: 2021-04-07 21:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1895319b47709c02dfc9fbeeb9982d32 SHA-1: 785a3aa0691a0e4759eeed6e2000b7687b49618b SHA-256: 7273e35f47a2ef1c712067e70bc90933a4ca9e6b6c28d571989be323bad8e361
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure or are part of a link farm. The ClamAV detection and ML classifier also indicate malicious intent. The primary goal appears to be directing users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/aws?utm_term=how+to+do+exponents+with+different+bases
    • https://cdn.sqhk.co/wuvotalek/Bgd86yU/kixekifaza.pdf
    • https://cdn.sqhk.co/wixefawoz/iejje2J/infinity_symbol_text_copy.pdf
    • http://gouliwer.online/mustang_cobra_super_snake_for_sale8dcoj.pdf
    • http://thiswaytovogue.com/47979711675d75ue.pdf
    • https://cdn.sqhk.co/moserusoba/oqFHcjj/85016304944.pdf
    • https://cdn.sqhk.co/kulabokirow/h2Nlhga/varojepikej.pdf
    • https://cdn.sqhk.co/lowovegoxoji/40uihib/algorithms_robert_sedgewick_4th_edition.pdf
    • https://cdn.sqhk.co/gituridewo/Jjigdty/kovujif.pdf
    • http://trysalon.xyz/68764429009nvm25.pdf
    • http://hookup157.site/hawaii_five_o_episode_guide_1968t6dki.pdf
    • https://cdn.sqhk.co/remezebona/IojePWV/bejeweled_classic_para_pc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_7f7b4719b0c04857aa106d996273733a.pdf?index=true
    • https://a6053a4b-6066-498d-92a8-7748b68531bc.filesusr.com/ugd/5f0d2f_7e63bf7304ee42c585a330baccba4c7b.pdf?index=true
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_4c5f829237cf4891a07b12f00d67df8a.pdf?index=true
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_ae4b54dca12a41d7be7f88318e53a5f8.pdf?index=true
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_b9f0aa84b1f444f9a71334197995ad9e.pdf?index=true
    • http://guxenubegipus.epizy.com/brother_3170cdw_toner_level.pdf
    • https://ac25a69f-a984-4293-9c3d-8c9e0f062535.filesusr.com/ugd/cbf077_63269edbf1a2493899f9f0d5cd5dbe30.pdf?index=true
    • http://gezujoju.epizy.com/accounting_equation_free_download.pdf
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_d921be751b274b37a2416a1eb1510c8a.pdf?index=true
    • http://satuzolo.epizy.com/jinajiwakulaxigato.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcbf.bin
d293c4e88bf3e2105da665d066557a715fcb39cf493518e99b3ff18a34fc66eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 5148 bytes
font_01_sfnt_off00010e3c.bin
a03c236e8cc7e54b2a0fd404132fd995cdc419a7f1a77109823da590b79cbe72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3C 12248 bytes
font_02_sfnt_off000137d1.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137D1 4324 bytes

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