Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6b7657aaabe03e…

MALICIOUS

PDF

84.7 KB Created: 2021-02-28 11:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46738ef639b2e49cdd449ee7aec3f84d SHA-1: f894f4df7b5c23a1e8097205eed9cae28350a70e SHA-256: eb6b7657aaabe03e9fad6fdc3c6a90960b8c44f7b2344140919fd9696dbf7cc2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://kuzutuzo.ru/strik?utm_term=conflict+resolution+skills+in+professional+nursing+practice
    • http://anarchymedya.com/716474549777qtcj.pdf
    • https://cdn-cms.f-static.net/uploads/4380700/normal_5fd77c7d1645f.pdf
    • http://xinupavob.iblogger.org/aeropress_brewing_guide.pdf
    • https://cdn.sqhk.co/panafilaputu/iMjeUgf/retro_brick_phone.pdf
    • http://merishwheelrecords.com/32164403882k51r0.pdf
    • http://rmk4sale.xyz/louise_hay_quotes_on_healing6gw3h.pdf
    • https://static.s123-cdn-static.com/uploads/4393506/normal_5fed6af111a64.pdf
    • http://wapajag.22web.org/rolujofodada.pdf
    • https://static.s123-cdn-static.com/uploads/4374968/normal_5ff15bb0574e5.pdf
    • https://cdn-cms.f-static.net/uploads/4365542/normal_601e63df3230c.pdf
    • https://cdn.sqhk.co/xevowuto/6xVVhhv/lonefubofo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://sozogakuvigoxev.epizy.com/hafele_catalogue_2016.pdf
    • http://veputowiki.epizy.com/boogie_woogie_bugle_boy_song.pdf
    • https://s3.amazonaws.com/fekife/android_adb_shell_reboot.pdf
    • http://gejulakan.epizy.com/mefadizawit.pdf
    • https://s3.amazonaws.com/wupixufekijax/buffoon_crossword_answer.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_off00010314.bin
d1dffe5d79b8f258b472c2d12f8933ecf689ad83dd5cad305a59cf855138c7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10314 5152 bytes
font_01_sfnt_off000114af.bin
5add5fa7c54b5e781063733e3033f8edfe96a8093a8a270ceb1d4394e07bcd97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 9856 bytes
font_02_sfnt_off0001367b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1367B 4324 bytes

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