Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3638411fad524bc…

MALICIOUS

PDF

80.7 KB Created: 2021-01-13 13:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0152f47a7445379db38681affc20f5f9 SHA-1: 01536113a072d8560f1d936fa60c364a72d7e158 SHA-256: a3638411fad524bc706d1804944e5a324ed79516869521d3b4841d823c9354e2
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, suggesting a phishing or malicious content distribution attempt. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous external URLs indicate a likely attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/wb?keyword=home%20design%203d%20gold%20plus%20pc%20free%20download PDF link annotation
    • https://site-1176776.mozfiles.com/files/1176776/55396076484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_5f9bd9d10a4fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f941b92f295d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_5f94c9a8d43be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456667/normal_5fa401be747fc.pdfIn PDF document text
    • https://site-1179389.mozfiles.com/files/1179389/anime_world_avatar_creator_2.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/jdjheid/bopokaputarelek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465394/normal_5fc22dbfd8dad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401697/normal_5ff4ef1d4112b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485442/normal_5fb68b930c6e0.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/rotizebokakojelu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421612/normal_5ff9b6dd1af08.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_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 5692 bytes
SHA-256: 417b3b1e6bb363b736e1413f7f1cf476c45c9ab37897c48542ff6c995398951e
font_01_sfnt_off0000f57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 12552 bytes
SHA-256: 94e6a3e52964527b5fdc9bd4607ce5e4dbf0a921df8bba426e95893e65331093
font_02_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 16896 bytes
SHA-256: 6823c6c3045a36135a3d9ab95c8d3395631272c592aaeaba1514ffd3e1f5fc41

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