Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae9a6da78d6d159…

MALICIOUS

PDF

76.8 KB Created: 2020-12-02 15:55:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83b7c9c11beb03d2de909e5c19d13a2d SHA-1: d14e2f003c4f2841880561da11f76ac01734a41a SHA-256: 5ae9a6da78d6d15969332785c155b471ff6c18de4c9f68f132d9e2f7937f4282
214 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a malicious link farm, with numerous embedded URLs. One critical heuristic identifies a link to known malicious redirector infrastructure, suggesting an attempt to lead users to phishing or malware sites. The ML classifier and ClamAV detection strongly support the malicious verdict. No scripts were extracted, but the primary attack vector appears to be the exploitation of embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/strik?utm_term=i+was+a+teenage+werewolf+michael+landon
    • https://vunakeba.weebly.com/uploads/1/3/4/6/134623580/vimegovovudakule.pdf
    • https://rawudirujitasep.weebly.com/uploads/1/3/4/5/134588445/2181464.pdf
    • https://zotolujirerezo.weebly.com/uploads/1/3/4/5/134582396/838edd07a55bb5.pdf
    • https://zisinifaja.weebly.com/uploads/1/3/4/5/134599776/444e66.pdf
    • https://static.s123-cdn-static.com/uploads/4489429/normal_5fc7331a24d9d.pdf
    • https://cdn-cms.f-static.net/uploads/4392210/normal_5fb932d04d163.pdf
    • https://pudakivofuleges.weebly.com/uploads/1/3/4/8/134853743/bibaxejirivofo_fuxolanafiwimis_xuvoxilesut_fojopilexewa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b025a370-369c-4758-8d60-d4402ebe634e/23474481435.pdf
    • https://uploads.strikinglycdn.com/files/4ab04ba6-244b-4b73-b50e-d040c06e03db/claves_de_cruz_roja_costa_rica.pdf
    • https://uploads.strikinglycdn.com/files/e78e61e1-eb72-44b9-b994-a39d0cf4f863/22264006090.pdf
    • https://uploads.strikinglycdn.com/files/a13f7e74-951d-42c7-94b0-39977614ac9f/cps_calendar_2019-2020.pdf
    • https://uploads.strikinglycdn.com/files/befd4614-a80f-4715-b96b-e36951b0a266/trucos_de_gta_vice_city_psp_chaleco.pdf
    • https://uploads.strikinglycdn.com/files/66b98f14-b49c-481c-80ed-53f3d3a61a3f/zoxaxogodapizikitusi.pdf
    • https://uploads.strikinglycdn.com/files/8026f4fc-bbbc-41f1-a1fd-c1e48880dda3/jewazumewafe.pdf
    • https://uploads.strikinglycdn.com/files/55579672-8b25-409e-825a-a0c05c208e15/gamecube_isos_free_download.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_off0000ee0c.bin
bb036c3c6480e58e9a31b9414ea4fca20cb29b5f5f1cf62b5a8a1dfc9ab46bb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 5464 bytes
font_01_sfnt_off0001008e.bin
07b508411c520de0fd8ef8d0fd74c2e1f93f4527175a1993e8d07062924328b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1008E 11236 bytes

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