Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe4785778bf82c1…

MALICIOUS

PDF

67.5 KB Created: 2020-11-24 15:40:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee6c995de1f9fc705226c3b8a261262f SHA-1: 5993ff2b7188d30b778572f775cec62e147a7704 SHA-256: dfe4785778bf82c15e3f7d92d9f0b189fa4cc14c9edf7805d0481a6d87c78135
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in SEO poisoning or phishing campaigns to direct users to malicious websites. Heuristics indicate a link farm and a phishing/trojan detection by ClamAV. The presence of embedded URLs and the overall structure suggest an attempt to redirect the user to a potentially harmful site, likely for credential harvesting or further malware delivery.

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://traffnew.ru/strik?utm_term=coleman+tech+charter+high+school
    • https://cdn-cms.f-static.net/uploads/4482853/normal_5fae92a11830b.pdf
    • https://cdn-cms.f-static.net/uploads/4465557/normal_5fa2b0576dfa9.pdf
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5f893748e4575.pdf
    • https://rulutateve.weebly.com/uploads/1/3/4/6/134653171/jorirewukipu-setemute.pdf
    • https://cdn-cms.f-static.net/uploads/4406501/normal_5fa507062a54c.pdf
    • https://cdn-cms.f-static.net/uploads/4379626/normal_5fa41d6d6e32a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zerepuzuze/borrower_s_authorization_form.pdf
    • https://uploads.strikinglycdn.com/files/186c4e17-6694-4d64-a4ec-d7e5390adec0/roberto_gonzalez_dr.pdf
    • https://s3.amazonaws.com/zifozujiwi/41843415023.pdf
    • https://s3.amazonaws.com/wonoti/17005503650.pdf
    • https://uploads.strikinglycdn.com/files/08a2b4ad-bcb0-45d9-a711-f0f9b312c4ec/8352668269.pdf
    • https://s3.amazonaws.com/gofiguj/character_worksheet_2_answers.pdf
    • https://uploads.strikinglycdn.com/files/7bf0a182-697e-4b96-9c51-5b07b974a585/wrong_turn_3_full_movie_in_hindi_dow.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_off0000ca51.bin
469ece03d5f9af01780df8f8a8f6d576a0960cd89c784290e2afa1ee1ee83beb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA51 5116 bytes
font_01_sfnt_off0000db84.bin
3c4e52a64cdade217390ff1254c425bfb6ccf863167e0440c0566b08a4eb17b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB84 11056 bytes