Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ff79ec4371ed09…

MALICIOUS

PDF

67.7 KB Created: 2020-12-20 15:14:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8f73f01ab7b56086b67d1ef0e8f447a SHA-1: 173ffc3ce7d5b474970d2b87e8ae9a6df3f12a32 SHA-256: 39ff79ec4371ed09e96ae24b532c485d862cdc2075096ddbafb36551f8b816e6
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, which is a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL is likely intended to lead the user to a phishing page or a download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cctraff.ru/123?utm_term=strategic+intervention+handbook+pdf+free
    • https://static.s123-cdn-static.com/uploads/4416125/normal_5fc88b2c60e32.pdf
    • https://cdn-cms.f-static.net/uploads/4424647/normal_5fd77753f11ba.pdf
    • https://static.s123-cdn-static.com/uploads/4446270/normal_5fd091974ad76.pdf
    • https://xepuxewezikute.weebly.com/uploads/1/3/4/4/134437058/vobigurupisibutijal.pdf
    • https://cdn-cms.f-static.net/uploads/4461219/normal_5fd7ebb734cf9.pdf
    • https://static.s123-cdn-static.com/uploads/4411923/normal_5fcdb78843f8d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b220b8bf-4fd0-42cf-a386-ff0f291f1c37/parts_of_a_compound_bow_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/743cf304-ee5f-4927-9f09-3dc2939ef23c/dirojuzarevunuwusanug.pdf
    • https://static1.squarespace.com/static/5fcf52f6665af30590bf3ca5/t/5fd144ed4e12041f681c5151/1607550191171/kevonasaxin.pdf
    • https://static1.squarespace.com/static/5fdec22607af9e0e16fda9dc/t/5fdf29ad6a6ad7222f26a8d3/1608460722843/juxavifo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bead.bin
e2b0792e4aa2ab67e44d17285433540c922658635cb4a585538fecea9feda813
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAD 5360 bytes
font_01_sfnt_off0000d0d0.bin
1de3ffc4f09c0963ac2e6714a0cf8f1d21b8588fc18080f9b700572e49e135e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 10308 bytes
font_02_sfnt_off0000f3c8.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 4324 bytes