Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f48d7352c7348bf…

MALICIOUS

PDF

73.7 KB Created: 2021-01-07 03:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: dbd3be09dbfbab3bd66d474a20a8c270 SHA-1: 249d93a511af4c5c494110c8baa10cbcaf5e388c SHA-256: 3f48d7352c7348bfd4b229e17b732ed67be5d4990b2364d206fb1cb3e24ba5b0
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, potentially a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 4

  • 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.
  • 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/123?utm_term=dragon+nest+guide+lvl+95 In PDF document text
    • https://cdn.sqhk.co/lugizumevemu/ahacs9x/34069253826.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385852/normal_5ff613013eb19.pdfIn PDF document text
    • https://nidupivulef.weebly.com/uploads/1/3/4/0/134042353/feridikalasamebexaju.pdfIn PDF document text
    • https://liwifaxuje.weebly.com/uploads/1/3/0/8/130874244/36fc94ff1967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455660/normal_5fdd2a90e6ce9.pdfIn PDF document text
    • https://gikowotezura.weebly.com/uploads/1/3/4/4/134493608/pebapiwid-mowitosur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465935/normal_5ff56d77d6391.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://uploads.strikinglycdn.com/files/e45a4185-9343-4f99-87b5-d9af4541f9df/what_is_a_firkin_in_the_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/ui_designer_resume_template_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB393 5216 bytes
SHA-256: 01ff003313b6d420c79c7e6ec5c35bf197e0f448fe758b6aa7f97d443467f06b
font_01_sfnt_off0000c55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55E 2116 bytes
SHA-256: 991f7ef292b59849fa1804c361c52a6255426db797fbcab3b5d31d1f34ee76c9
font_02_sfnt_off0000cf09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF09 11060 bytes
SHA-256: fc5e5392bf6b398eaea998201f9ab8996501192bdaf1cfa38e1808f1b4f66156
font_03_sfnt_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 16824 bytes
SHA-256: f53a36221de04e3f20202cc8a0d77077b1e06bd7717fd127d8b08a761f7681f9
font_04_sfnt_off00010baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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