Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd588e49f5740ac…

MALICIOUS

PDF

62.9 KB Created: 2020-12-15 17:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4facdb3696933bf58cd8054eaddfad03 SHA-1: d47f61a373c03f0198c8c5ba8c8e7746e07ebfd4 SHA-256: 3cd588e49f5740ac02e71cd356bfdedc5e97d54813125fdaecaa19210d2a5546
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to potentially malicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malware. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature.

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://trafffe.ru/123?utm_term=unblocked+games+1599
    • https://xiwofisenitew.weebly.com/uploads/1/3/4/8/134879753/2635e87effbd0.pdf
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/lujafabafudewun-pemisufab.pdf
    • https://static.s123-cdn-static.com/uploads/4472776/normal_5fcbd7ed9fd7e.pdf
    • https://static.s123-cdn-static.com/uploads/4491934/normal_5fcad44c86ae1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c3df3be1-37a8-4d08-92c4-ac77b38f67d0/63258225906.pdf
    • https://uploads.strikinglycdn.com/files/f1cee143-4f15-4b3e-908e-4cab0c865317/79617255723.pdf
    • https://uploads.strikinglycdn.com/files/3ea40cb0-1337-4da0-b9ef-8654c20e8943/kefifulagesudoxeparopeza.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdeedc7acac6192a855f7d/1606282974150/jeremy_lin_akatsuki_shoes.pdf
    • https://static1.squarespace.com/static/5fcee60965288022f4f57f26/t/5fd095bd3bcf75077a85b35c/1607505343584/power_rangers_all_stars_update.pdf
    • https://static1.squarespace.com/static/5fc5a999c14dfd36fe120027/t/5fc6e8e31d106d256bb40e29/1606871268008/tazekemobezofuliwiwonujup.pdf
    • https://static1.squarespace.com/static/5fc10561405d5340f32a3b3e/t/5fc5a5da9ee0f32b87168815/1606788570994/tefanibagofibusaku.pdf
    • https://static1.squarespace.com/static/5fc50b202e34347c705eef2b/t/5fcb3743bce7087d1ad9c219/1607153476097/funny_best_friend_status_for_whatsapp.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_off0000b78d.bin
71c925b4a54616b96cdb7fdfa05788275ca206696e58947c9e6b355f4772178a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB78D 5692 bytes
font_01_sfnt_off0000cae9.bin
110321aa8de351ac31f023b920591c031a4865dd428aa28b8d0a3cbc08a4f7e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE9 10616 bytes

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