Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec779056930f812…

MALICIOUS

PDF

75.4 KB Created: 2021-03-24 03:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0891f27d3b97660c936fbcdf45b334f8 SHA-1: eab00a3dea8f99b02baf056b082c6c1f3b9f4a71 SHA-256: 4ec779056930f8126c8b355143df3ba4b187c2f68090f988adf81c12b574ba0d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to a catalog, directing users to external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/award?keyword=catalogos+andrea+primavera+verano+2020+pdf
    • http://jiwapadenejeza.getenjoyment.net/best_python_book_for_programmers.pdf
    • http://riwozizedilar.mygamesonline.org/zozeliturinata.pdf
    • https://cdn.sqhk.co/rujiwujik/gchhhbT/best_deals_on_amazon_prime_uk.pdf
    • https://cdn.sqhk.co/repipedifavi/9geig0u/mivajepozomesoxewimefov.pdf
    • https://cdn-cms.f-static.net/uploads/4369166/normal_603e32efa365b.pdf
    • https://static.s123-cdn-static.com/uploads/4447079/normal_5ff2366c5e9a2.pdf
    • http://vowufijetapiko.sportsontheweb.net/fixabumene.pdf
    • https://cdn.sqhk.co/lexebogefaj/hiKHDCs/86934732684.pdf
    • http://roduvogixaxo.66ghz.com/99109158619.pdf
    • http://vemelaribox.getenjoyment.net/tork_pneumatic_actuator.pdf
    • http://favunewesazut.sportsontheweb.net/98064314078.pdf
    • https://cdn-cms.f-static.net/uploads/4391015/normal_60492fe2e359e.pdf
    • http://setopin.mypressonline.com/angels_in_america_part_2.pdf
    • https://cdn-cms.f-static.net/uploads/4370533/normal_6049caa249801.pdf
    • http://xafopawiki.medianewsonline.com/tojegebumap.pdf
    • https://cdn.sqhk.co/filemowa/9R38gh8/zokujeruwujevetaravuga.pdf
    • http://wamabivunufoteg.medianewsonline.com/brene_brown_boundaries.pdf
    • http://dalifajebuxog.scienceontheweb.net/zupenanofowevujonote.pdf
    • http://bajelow.iblogger.org/98826977953.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vitupofelomar.epizy.com/57340369316.pdf
    • http://badiwofotafazol.epizy.com/fillable_d_d_5e_character_sheet.pdf
    • http://wugadavax.epizy.com/the_beginning_after_the_end_book_2.pdf
    • http://wupidusujimi.myartsonline.com/ap_sachivalayam_books.pdf
    • http://mumamame.rf.gd/hp_4630_black_ink_not_printing.pdf
    • http://tesefosibat.rf.gd/nupunozosed.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_off0000e72d.bin
c990aa762e141c48b630452c1e4c2399dec1cac61ac751a4e86211a3abffcb0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 5600 bytes
font_01_sfnt_off0000fa27.bin
aa3b58f9deb7372eab829118c6d11fc0e3f67493c4a3c0691eaa03173f7bf2bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 11688 bytes

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