Malicious PDF — malware analysis report

Static analysis result for SHA-256 9471328e5fedcdba…

MALICIOUS

PDF

62.5 KB Created: 2020-12-24 07:07:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 458bfa9d0f4a3ca67b9eb5aa20d40efc SHA-1: 71c82dabec05a93fc587db2e17ae6685dc72e028 SHA-256: 9471328e5fedcdbadd23cb93f3a6d1e73355725dd9b3d8ba94d834544b60a9cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to PDF files hosted on file-sharing services, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/aws?utm_term=lagu+dj+minions+papaya+dance+remix
    • https://wamebadafexu.weebly.com/uploads/1/3/4/0/134040762/jorexujosi-wurerib.pdf
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/4cdff8.pdf
    • https://cdn-cms.f-static.net/uploads/4455176/normal_5fbcbbad0f6f5.pdf
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/f4cca9ce88.pdf
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/742509.pdf
    • https://static.s123-cdn-static.com/uploads/4401712/normal_5fe05c0e6d1fb.pdf
    • https://cdn-cms.f-static.net/uploads/4382413/normal_5f8ca00c4a22f.pdf
    • https://cdn-cms.f-static.net/uploads/4369343/normal_5fc2bb6b2e3f9.pdf
    • https://zuvopejibi.weebly.com/uploads/1/3/4/0/134017525/fegixeros.pdf
    • https://cdn-cms.f-static.net/uploads/4501479/normal_5fbd0f0880a77.pdf
    • https://cdn.sqhk.co/wukibezoso/jhfhbjg/82515859841.pdf
    • https://cdn-cms.f-static.net/uploads/4454280/normal_5fa0b667c10f5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/80047aa0-6f6f-4955-9cbf-93ce0c847b0f/livomesiwosabofux.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_off0000b6ba.bin
2a2a93eee1dc499e9e8c33c75ee417cf4d8fe73cf8852284243fe5894dead9ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BA 5548 bytes
font_01_sfnt_off0000c99b.bin
91bc066983bb625a552a1dcea962a906e7ec770c5aa0b70d6065a7616e1951b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 10312 bytes