Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bfabed0b48498c…

MALICIOUS

PDF

77.0 KB Created: 2021-03-03 06:56:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74be588616057c25478839f885879d53 SHA-1: ded9ee34a87fda645316727d71fa1ec0b2bf9532 SHA-256: e4bfabed0b48498c7d0b0692b29bda8adbe6d1f845588fb466413af369636c45
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

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://fokemale.ru/123?utm_term=what+are+the+rules+of+magic+the+gathering
    • https://static.s123-cdn-static.com/uploads/4458840/normal_5ff4f065d4d78.pdf
    • http://samoe-samaya.ru/jowazikizigevametusuzsine.pdf
    • http://istlan.space/jemugokiboxubufobarekehrty.pdf
    • http://nonowun.mywebcommunity.org/how_to_fix_a_watch_winder.pdf
    • https://static.s123-cdn-static.com/uploads/4424328/normal_5fec9bfecaf72.pdf
    • https://static.s123-cdn-static.com/uploads/4444374/normal_5fff2497b6715.pdf
    • http://kipegujodup.getenjoyment.net/firefly_2018_attendance_numbers.pdf
    • http://oneitstore.pro/74135664319vg8xq.pdf
    • http://runmasten.online/98465618920dwe7t.pdf
    • http://fafuzum.sportsontheweb.net/korureputumosaburumulu.pdf
    • http://grantmedica.ru/70456047506ryq5u.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pozidijapepore.atwebpages.com/81012886323.pdf
    • https://s3.amazonaws.com/wovigebi/samsung_a30_tendra_android_10.pdf
    • https://s3.amazonaws.com/rizijubovapuk/darajakaret.pdf
    • http://kakasis.onlinewebshop.net/80134469095.pdf
    • https://s3.amazonaws.com/sezebepit/p_alphabet_wallpaper_free.pdf
    • https://s3.amazonaws.com/xafaxotaful/walamatiz.pdf
    • http://nununad.myartsonline.com/xufabedinekukada.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_off0000f0dc.bin
7f19f153539a6780f9861e8255f85a4998af65a8d094d9e179761b68f59844e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 5308 bytes
font_01_sfnt_off000102d0.bin
77f20d9d995c5c7fb57cb1be1428af752b05930892f5f89c9ba9cd29d4a2bd78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 10536 bytes

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