Malicious PDF — malware analysis report

Static analysis result for SHA-256 350c05de2643980e…

MALICIOUS

PDF

68.6 KB Created: 2020-11-22 07:42:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 11223cb48dd0955041370256b90fcce0 SHA-1: 1d9e7f9184a6b92aca3d35b0410bebe9b9c254a1 SHA-256: 350c05de2643980ef9209d193f01bb2ac5c52b30a3e62fe8bf79b158126eaa8e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule, indicating it contains a large number of external links. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest a link farm or phishing attempt, likely designed 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 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.
  • 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://traffset.ru/123?utm_term=mega+man+x4+guide+zero PDF link annotation
    • https://galezarulunozip.weebly.com/uploads/1/3/4/8/134896955/1936818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_5f96908ca1704.pdfIn PDF document text
    • https://kipunokazapalu.weebly.com/uploads/1/3/4/7/134774983/sopenodusumi_watafizigilulol_zulup_bomesokisi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5f8c0668c1acf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462341/normal_5fb5809d11dce.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/84d72c68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383687/normal_5f92f6d0807ef.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/pibugosabezolo.pdfIn PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/3089918.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e913f20f-b70e-4162-b2b4-fad3792d577f/figurative_language_in_act_5_romeo_and_juliet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822d4f8a-b600-4fa8-bf93-9c20a1661194/wagofajatuvewizozaleto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b162cc-6459-4b47-b5a0-d60ba3dfda87/dumanarazuligazum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b0f8e5-bf5b-4ba4-9e6f-0a8aadfdf4f2/topemadexuxagaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ffd5c9-9a1c-4b6a-94b9-0d6cdd5a46ef/24411277640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1aaad05-790e-4ea7-893c-7cfc2e568233/everquest_leveling_guide_85_90.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c243fda-6516-4f39-baf4-e1f40129cb77/13703997672.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD087 5148 bytes
SHA-256: d4282e9a179a4ae1288f4b091c2af023895de2e19213b908a02bfc380bf345f5
font_01_sfnt_off0000e210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 10288 bytes
SHA-256: ceb744b668625909aede489ec77313cef447cad2b0f251724c22e1419c4ec0f7

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