Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c358ba04f1b53df…

MALICIOUS

PDF

34.3 KB Created: 2020-11-08 23:28:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 23b89d9b17741b9b1532ee926fc4398c SHA-1: 0e3d87ffbbc305267fbdda3d941b1ad9678977fd SHA-256: 5c358ba04f1b53df665cb9ff1d142d94392eaf562f2a127a2a16c04e28d0e638
94 Risk Score

Malware Insights

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

The PDF contains an embedded URL that points to a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to lure the user to a compromised site. No scripts were extracted, but the presence of a malicious redirector is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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://traffine.ru/123?keyword=cuddeback+white+series+8mp+manual In PDF document text
    • https://gejimedetudumi.weebly.com/uploads/1/3/3/9/133997730/repawedofuzot.pdfIn PDF document text
    • https://mebogizudoredo.weebly.com/uploads/1/3/4/4/134472702/850d040609fdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5f9e22127dca1.pdfIn PDF document text
    • https://senapuvuv.weebly.com/uploads/1/3/4/4/134459053/69827e1cf71b.pdfIn PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/0694954a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422136/normal_5f9c5f243a535.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/0e0055c2-c94c-43cd-b1a4-070d1263cba3/daxigonaloruxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f68681b7-97cb-4fc2-af24-2ba5e9b6a619/conjunction_worksheet.pdfIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/nozemapopumetuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc7acc8-f477-4e23-a669-66c198ebd07e/drunk_fu_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4d41b6-fded-4e50-be75-36481e019c09/zikaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb958daf-cf3c-418f-9726-365a442bb9f1/83193323876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67523101-b0af-49a1-b73f-986cdcffebdd/intensitC3A9_de_pesanteur_sur_mars.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_off00004864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4864 5708 bytes
SHA-256: a585bcb93a55b0385020518b3ff47417c2cbd9b4f455353e48b9a1ce944c1bf1
font_01_sfnt_off00005bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAE 9716 bytes
SHA-256: b96e730090e9b06bd8bbfa60899596d099f986a5465a32d1e8d98a8524b2d738

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