Malicious PDF — malware analysis report

Static analysis result for SHA-256 813ceda238acbacd…

MALICIOUS

PDF

76.6 KB Created: 2021-01-08 15:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 78b0b1197fe03276ab68ca8d96d0abcb SHA-1: dcca51c1073e948ee9d082c7066f2d0db335c430 SHA-256: 813ceda238acbacd75cab89871b1f18750c6a35e7a0fb5d7fd3f9640e3c5c719
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external PDF files, forming a link farm, and also redirects to a known malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded content, though obfuscated, suggests a lure related to game downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffking.ru/aws?utm_term=beyblade+burst+evolution+game++for+pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5fd165dc6691f.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/lidq7qN/gardenscapes_online_game_play_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5fe7787c7f7d8.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/morijozaweve-radiru-guler.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/5d44e40a7bf30.pdfIn PDF document text
    • https://kobuzefejara.weebly.com/uploads/1/3/1/4/131437799/leleridasibonunokek.pdfIn PDF document text
    • https://gapibuxox.weebly.com/uploads/1/3/2/6/132695643/8761891.pdfIn PDF document text
    • https://cdn.sqhk.co/dowufagit/jf9njj2/shoot_em_up_pc_games_list.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/3850ce1e-5d19-432a-a83c-358644b9fbfc/limajatogiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad2f503a-adc9-471f-bcca-262a6ac19841/32073673035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85aba792-74dc-4b28-9302-e9d9560ad8c5/moxitinuvemod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1cd6778-950e-4ff9-9955-88125a46d6cd/fafomezelowaxirugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7557ffc-6ee8-4a02-8653-d80d8602fd25/xuweturemu.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_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 5824 bytes
SHA-256: 1c27186b02564818e031982b2440b775d1ffa2da4fc63024f0b721b2a2636840
font_01_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 10816 bytes
SHA-256: 9f78c353024f9ca73eeb90bfbdfee9879fedf008618c05456c99409d27a472db

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