Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cf99ba50221a46…

MALICIOUS

PDF

410.5 KB Created: 2020-12-16 05:34:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3ac7c99cb31b34a75ff25069f18db17 SHA-1: 75ca7222cde2c7eb1855380919f72aa1d80dc956 SHA-256: 33cf99ba50221a464722d5918c72dabf08204823590db96eaf4c1ace8e8b71ef
154 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. A critical heuristic indicates the presence of a PDF link pointing to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/123?utm_term=the+death+of+the+moth+pdf'. This suggests the document is intended as a lure, likely for phishing or malware delivery, and is delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9810

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://ggtraff.ru/123?utm_term=the+death+of+the+moth+pdf
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5f9309b17d168.pdf
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5fbabd5a90134.pdf
    • https://static.s123-cdn-static.com/uploads/4374373/normal_5fc6936da1e1d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bezegoluzose/minecraft_tree_houses_videos.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6acafa04221c7118ac98/1606380235419/96938563166.pdf
    • https://static1.squarespace.com/static/5fc12a1c9698b02c7f224c6f/t/5fc44df861e25426e1c13bc5/1606700538292/40773476017.pdf
    • https://s3.amazonaws.com/luropi/xowoxeluwezarow.pdf
    • https://uploads.strikinglycdn.com/files/1426a815-1aa2-40ce-9905-55fbf1124568/97545160303.pdf
    • https://static1.squarespace.com/static/5fc2c8fa27a199023ac1a380/t/5fc41f8da97599144e79fcb7/1606688654640/pain_r_t_nursing_diagnosis.pdf
    • https://static1.squarespace.com/static/5fc1b3b3085bf90c0e02b495/t/5fc5abb8a97599144ebd1a9d/1606790072599/insinkerator_badger_1_manual.pdf
    • https://static1.squarespace.com/static/5fc53afda3bf4b14abc57bb9/t/5fcb4251bce7087d1ada6f33/1607156306326/history_of_european_union_timeline.pdf
    • https://uploads.strikinglycdn.com/files/18b7ab6c-7464-4389-a62f-fb4a8452e592/gewujokabub.pdf
    • https://static1.squarespace.com/static/5fcf3bb6cd9942793f26d34e/t/5fd221c10f163860c7b7282f/1607606721486/nexenabegojo.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_off0006248b.bin
2166cdbe24a9b637009d18bba79fb2974ab133fcb53fb7d1284060bb11badf55
pdf-font-stream PDF embedded font (sfnt) at offset 0x6248B 4924 bytes
font_01_sfnt_off0006352a.bin
b5e648372ef8ac064102a9c6e97840eed682cfd078cefa81a5a5ccb41f5a2eee
pdf-font-stream PDF embedded font (sfnt) at offset 0x6352A 11472 bytes