Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b9d2178e0243b0…

MALICIOUS

PDF

68.1 KB Created: 2020-12-06 07:08:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa33197d42b6a3e38e8393537376e7f7 SHA-1: 79781a1866bcfb2eadbdbc87d99229c7fe204dd7 SHA-256: 32b9d2178e0243b09b44bbed7229377532c5a2a53076fad9f55fd112440e5f1e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://traffmen.ru/strik?utm_term=jnc+8+hypertension+guidelines+2019'. This URL is likely used to lure the user to a phishing site or download further malicious content. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=jnc+8+hypertension+guidelines+2019
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f8d92c71d7c1.pdf
    • https://cdn-cms.f-static.net/uploads/4491669/normal_5fc31a3fc0556.pdf
    • https://cdn-cms.f-static.net/uploads/4408871/normal_5f95241928d03.pdf
    • https://cdn-cms.f-static.net/uploads/4386073/normal_5fc08cea54b21.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lorifumofelu/23556350939.pdf
    • https://s3.amazonaws.com/garorowa/juzadazefuvixut.pdf
    • https://s3.amazonaws.com/nigimul/free_videohive_project_files.pdf
    • https://s3.amazonaws.com/xatojem/28060997430.pdf
    • https://uploads.strikinglycdn.com/files/c00c71dd-19b8-4c57-a4ed-8b234b4956bf/kafilakufabika.pdf
    • https://uploads.strikinglycdn.com/files/3bacdf31-3f19-426d-8ab8-6b734d768b9e/english_high_school.pdf
    • https://uploads.strikinglycdn.com/files/43a11834-94db-4da0-b40d-78b83a67a222/wilogeni.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_off0000ca13.bin
adfe2c105c8a19740e00a34daf58721d3654c0eafeea386fa8ad4f577d127978		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA13 5892 bytes
font_01_sfnt_off0000de26.bin
a7649169a4ce2407415f7edd083e7e0b2e8c6e84e1552c15bb93e84d5fe9e3c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 10916 bytes

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