Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79628b4fd2e3389…

MALICIOUS

PDF

70.1 KB Created: 2020-11-10 23:12:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 869911b5a44ad28e0ac97e2038375a33 SHA-1: 1cb6ccbd1bebf108db110a80881b7953db1dd2a5 SHA-256: e79628b4fd2e3389af988f3d67a23feb0ae214f66a74de8c7269105c69ca6b79
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'traffine.ru'. The ML classifier also strongly flagged this PDF as malicious. The embedded URL is likely intended to lead the user to a phishing or malware distribution site, disguised as a 'special request chit'. No scripts were extracted, but the presence of a malicious URL is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

Heuristics 4

  • 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.
  • 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=special+request+chit In PDF document text
    • https://rubavuwo.weebly.com/uploads/1/3/4/4/134403239/fozemuvekabu-basixaduze-natelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f88de216cd05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_5f9e948841c31.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/3cad3764509d.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/metifefosamusotuji.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/tiladejonu.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/wazorixekunafob/2199792830.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/kajapojivuzigeditiw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90B 5252 bytes
SHA-256: 9fda4b784a945e4f371e6cf29f57b83c3facf23f3e192d468e618828d1ba7580
font_01_sfnt_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 2052 bytes
SHA-256: cf9c1e7c4795f593e6be280a9da9eebe143199a0e68a1948165c4d977dd27746
font_02_sfnt_off0000e46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46E 11852 bytes
SHA-256: 84c5bc052e05c819e21e9cf1fe24c7c25d717d527c11bf1f1db4468474a4872e