Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa5c5ad8dc606d9…

MALICIOUS

PDF

218.4 KB Created: 2021-01-14 05:22:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c9ab8910b87412a8c186f1a905046841 SHA-1: 51d4af5555d1c30fb7b617c3fc2203d0d1523a20 SHA-256: baa5c5ad8dc606d99180b4c91fcb772608d70ec875d4e27b64b2698768a51e0d
96 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The PDF structure also exhibits duplicate object bodies, which can be a technique used to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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://trafftec.ru/aws?utm_term=subarachnoid+hemorrhage+nice+guidelines PDF link annotation
    • https://site-1171643.mozfiles.com/files/1171643/pularez.pdfIn PDF document text
    • https://radelemetiwiwi.weebly.com/uploads/1/3/4/5/134520029/8787450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478146/normal_5fdc1f9a2ce1c.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/bekabasuref-rexokaxu.pdfIn PDF document text
    • https://site-1175508.mozfiles.com/files/1175508/degorumuxaluriroziborid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374983/normal_5ffb0ec14732d.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/69a30d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377120/normal_5fe3d9561b7f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5f9b7dd1e36ae.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/1150995.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403814/normal_5ff847398de15.pdfIn PDF document text
    • https://site-1206084.mozfiles.com/files/1206084/6070611926.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/b0566884.pdfIn PDF document text
    • https://site-1166708.mozfiles.com/files/1166708/6358164039.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00031d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D89 5596 bytes
SHA-256: 40a9f30c2f99f68482cd2fceca7430599ff294be4a57cf19a175906287270151
font_01_sfnt_off0003305b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3305B 14376 bytes
SHA-256: 531632cd5b3684abd6b7f8e56626e9c538ab332766021a318805defec0574581