Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd0bfc6622feabb…

MALICIOUS

PDF

75.5 KB Created: 2021-05-18 16:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cae7f3e1dda2fa52edbd9d45a38f7c73 SHA-1: 7ed6bc435474a7c94b3d56b22e127f5dc16ac373 SHA-256: 2cd0bfc6622feabbdfc34007fcf0b10facc1602d0fcc3628e6f3ab7fb1679a03
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting or known redirector infrastructure. The heuristic firings indicate this is a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence suggest a malicious intent to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/strik?utm_term=what+is+literal+and+nonliteral+meaning In PDF document text
    • https://mokowevabib.weebly.com/uploads/1/3/0/7/130739664/1493424.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415518/normal_5fef1ac16cee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466146/normal_602edc0d351c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384817/normal_602958c5ecc3c.pdfIn PDF document text
    • https://gakosokilexavum.weebly.com/uploads/1/3/2/6/132695298/3552536539d4e90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_6045702973a07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415292/normal_5fc9eba7460e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_5fdd88c9c6723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449984/normal_6036dcc0bf24f.pdfIn PDF document text
    • https://kupifima.weebly.com/uploads/1/3/0/7/130775493/gegivesaru.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/xagudelesotalif-dozitixekodasu-fimiririk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474192/normal_602461207e2fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451377/normal_60515a6a0f613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488556/normal_605cb18aaffe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_605c70e7344d6.pdfIn PDF document text
    • https://mivuwapirodi.weebly.com/uploads/1/3/2/6/132681474/2761907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462736/normal_60232b3ea3637.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/8d30daf8-bace-4507-8c65-5817f719ee71/vesivogavekewur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/248e124b-7b99-47dd-8c60-5adbaa51a74a/skyrim_se_mod_deadly_dragons.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/hollywood_reporter_roundtable_cinematographers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2802624f-e302-4555-a001-11af8ca91438/21836012404.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/74485243177.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_off0000e8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 5252 bytes
SHA-256: 200f9818f2788c2ef98e18a766c70f7952f55b88517751c6f0335356df002e53
font_01_sfnt_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 11868 bytes
SHA-256: c4771cc1b1e3bca11a6e9155fbc8da7f622830e75badff83f532394cc1d6943b