Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee81dc763e12fe96…

MALICIOUS

PDF

128.6 KB Created: 2020-12-16 12:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 47c73113a08a15d8056a0e145d21dbe0 SHA-1: dcbae5d935b4ef607bd2f7d7f6de4db55df2ec84 SHA-256: ee81dc763e12fe9642326c38a8d15f2c267f8f65283b46b45ae6550c90a8c365
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to lure users to potentially harmful websites, possibly for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ggtraff.ru/123?utm_term=chi+fu+mulan+2020 In PDF document text
    • https://vizefibamoraxob.weebly.com/uploads/1/3/4/6/134613498/kemix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390328/normal_5f9f5e99b314f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392868/normal_5fbb1d50b6c62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_5fa81f6dabe4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419205/normal_5fad85d0c6776.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc537ce3398ff75154a1c50/t/5fc6a27408845d092474f4bd/1606853242688/xusikeli.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/chapter_11_cisco_exam_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/334f4f72-7145-4e04-a2df-6dbbd9e9b65c/9277165939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abd7c74d-a4e8-445d-88cf-4ed3e0f30282/descargar_internet_download_manager_para_android_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66270e11-5e5c-43d7-974f-8606e36844a9/ludezelukakigaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b918d92-db18-42a0-92dd-97ed5e02adcd/88314994929.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/wimuragadipotux.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19957 6416 bytes
SHA-256: 590ff9cd3e5defaf98b2d62c899f2f34a9a6442f5d17d01ea2342dc3009b37f9
font_01_sfnt_off0001aefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEFE 4604 bytes
SHA-256: 9b08cdd791d50dbdffb914de47bd3eeca5c1d50d001e356f92f59c0bd7841b5b
font_02_sfnt_off0001be6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE6B 11888 bytes
SHA-256: 4c155525072447c10ad2c7ee8bcd62477741de74b0c7ad832890819102794864
font_03_sfnt_off0001e6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6C9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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