Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29caf1fe28bb178…

MALICIOUS

PDF

107.9 KB Created: 2021-01-13 11:05:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b6e7e65e2b70a07c34c0cb02096ee44f SHA-1: bc0fa2dcba655794fe61f5f6b283cf4a55f4abaf SHA-256: f29caf1fe28bb1786d0864438b8e712d46f3fa76b7726c253d715c02e4098179
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to educational materials. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=grammar+and+language+workbook+grade+7+answer+key+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4382621/normal_5fe36b1021de7.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/lonulugemoraxu.pdfIn PDF document text
    • https://site-1201629.mozfiles.com/files/1201629/18817127796.pdfIn PDF document text
    • https://takewinedol.weebly.com/uploads/1/3/4/7/134768260/7086984.pdfIn PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/jozetajugivu.pdfIn PDF document text
    • https://ronifevux.weebly.com/uploads/1/3/4/7/134737402/85536.pdfIn PDF document text
    • https://site-1174832.mozfiles.com/files/1174832/best_free_html_to_converter_c.pdfIn PDF document text
    • https://site-1177077.mozfiles.com/files/1177077/1725613189.pdfIn PDF document text
    • https://site-1168066.mozfiles.com/files/1168066/grand_police_stickman_rope_hero_vegas_gangstar_crime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavale/english_alphabet_writing_worksheet_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/ropadakusuge.pdfIn 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_off0001695b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1695B 5872 bytes
SHA-256: f30938828c32b0eb232b74c4e269fa3e302995c2c5a85dcf15be14ff6eed8d1a
font_01_sfnt_off00017d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D64 10784 bytes
SHA-256: 09d12003b0777a00d61b032278e7b8a294685a0a2f49bab13146570ee8a14e33

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