Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbf51bde06938f1…

MALICIOUS

PDF

83.4 KB Created: 2021-01-03 03:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 634a882ff922893d6dc6164b187acc99 SHA-1: eae034feaff2090869ffcfe8d0a84c10dae9591c SHA-256: 8cbf51bde06938f1f02f83ce706cbc03b58809774950ba96f95bd00e0d5d68c5
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, pointing to potentially malicious redirectors and external PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and embedded URLs suggest a malicious redirection scheme.

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://gettraff.ru/aws?utm_term=legend+of+zelda+theme+sheet+music+guitar In PDF document text
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/55a615b54a42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444098/normal_5fc64e96be1a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376850/normal_5fe2900808f09.pdfIn PDF document text
    • https://nogisapu.weebly.com/uploads/1/3/1/4/131453993/94a29b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5f8c2a9658700.pdfIn PDF document text
    • https://vubosetupis.weebly.com/uploads/1/3/4/5/134594606/859a6b3174e04.pdfIn PDF document text
    • https://gabodudir.weebly.com/uploads/1/3/4/7/134717456/mefizijikofevosofak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_5fb9a5580c19b.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/govifitubodovelaz.pdfIn PDF document text
    • https://pofaleronuk.weebly.com/uploads/1/3/4/7/134722597/fosafa.pdfIn PDF document text
    • https://zodemabu.weebly.com/uploads/1/3/4/8/134896511/razajulo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465263/normal_5fc417cbef3d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418557/normal_5fa6e7c80c0c1.pdfIn PDF document text
    • https://fimetopim.weebly.com/uploads/1/3/4/3/134399480/jalejogupoguven_bufadusarolewu_vofukomorod.pdfIn PDF document text
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/f84f6b3029104.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392463/normal_5fdd1d1dc0835.pdfIn PDF document text
    • https://serofijukepaba.weebly.com/uploads/1/3/4/6/134693026/7183062.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 5424 bytes
SHA-256: aed841c509472459dbe86c05d8cc090faed97fa474dfd4cb1d0546d03a0edc06
font_01_sfnt_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 10772 bytes
SHA-256: 002c61288239bbbec87a7b8216d361df0b436cb731b243006e650b66cdfdcd23
font_02_sfnt_off00012b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B23 16100 bytes
SHA-256: dbe3dd64dc066f428802739f18684eaf08c446fcda8cbe88d420f1ef9ee6b29b

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