Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf5c28fd4e4b0c7…

MALICIOUS

PDF

72.8 KB Created: 2020-12-28 15:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9031b02690fe8778a7d42ea59c5b7da0 SHA-1: 532e4ab349c8d5649b16fad71f447c970aa2d41c SHA-256: 0bf5c28fd4e4b0c77c8cf9de3b6890989d885a50e0f4f53074b889e23779e633
234 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body mentions a QR code for "essential services", suggesting a phishing lure. The presence of multiple PDF links and a malicious redirector indicates an attempt to drive traffic to potentially harmful sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://traffmen.ru/strik?utm_term=railway+qr+code+for+essential+services
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/5476235.pdf
    • https://cdn.sqhk.co/zokasejiz/Ejeqjgh/pufelojidelakogupomabewe.pdf
    • https://kojusano.weebly.com/uploads/1/3/4/8/134872417/xamusazemowuzogiji.pdf
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5fa9e8a2a9d04.pdf
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/23477a0a.pdf
    • https://cdn-cms.f-static.net/uploads/4384642/normal_5fd7d63649db4.pdf
    • https://cdn-cms.f-static.net/uploads/4384028/normal_5f8e571589645.pdf
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5f8d36644883e.pdf
    • https://static.s123-cdn-static.com/uploads/4449604/normal_5fe4405585c63.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/71437848-7834-4a25-b331-5085de11fbfa/54969003819.pdf
    • https://uploads.strikinglycdn.com/files/868eff4e-6b76-47c9-98c9-4f79cd1f33e5/84453533955.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa1.bin
db2a24e913248a4e776454446ed319c014a499ce90ea87d7ae1e2854061b6d99
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 5400 bytes
font_01_sfnt_off0000f234.bin
af09ccccbe1258fe268f8aa25af375a4d57981c153556e056010995b8360c15c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 10648 bytes