Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdb9f6eca74128f…

MALICIOUS

PDF

73.0 KB Created: 2021-01-13 02:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0fcf8de7e37d0cd4aac72c5dd5e82828 SHA-1: 2059897e30528524751c88be2a99c76d238a3f0e SHA-256: 5bdb9f6eca74128ff06006aee66ec5d5b4d3bb0b07028a396dec90a866f69831
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a malicious intent to drive traffic or phish users. While no scripts were explicitly extracted, the presence of embedded URLs and the ClamAV detection strongly suggest malicious activity, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=ncaa+division+2+baseball+conferences In PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/6244135.pdfIn PDF document text
    • https://site-1193440.mozfiles.com/files/1193440/john_gba_download_apk.pdfIn PDF document text
    • https://site-1168264.mozfiles.com/files/1168264/97756860848.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/66479791795.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/conventional_loan_guidelines_employment.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/1448104318.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/98113850670.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/format_0._00_0._00.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/52882905111.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/john_5_commentary_bible_hub.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/gregorian_chant_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/88058350389.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/2nd_law_of_thermodynamics_chemistry.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_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 5316 bytes
SHA-256: 8e95dccc17564c894603c1430dddeff4350787fcd1d3d85fbdbdef85a96b9207
font_01_sfnt_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 11244 bytes
SHA-256: 177d977eb9b6e7edd0de0e81994af5bc4a47842a6befdc120553397e52b688ce

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