Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3fa4caa2cef45f…

MALICIOUS

PDF

69.3 KB Created: 2021-01-19 06:10:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 50d2eaca5680f4df0ee1b0dfbfa5a3e7 SHA-1: 239afb6537074d203ead451716da3bde09d22292 SHA-256: cc3fa4caa2cef45f95687c48bf865646b6a87686c118ceadf2202834e8d4aabe
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=what%20is%20minerva%20mcgonagall In PDF document text
    • https://site-1255351.mozfiles.com/files/1255351/corki_guide_probuilds.pdfIn PDF document text
    • https://site-1168129.mozfiles.com/files/1168129/the_chosen_app_review.pdfIn PDF document text
    • https://site-1166042.mozfiles.com/files/1166042/the_crowd_gustave_le_bon.pdfIn PDF document text
    • https://site-1174578.mozfiles.com/files/1174578/datotamenap.pdfIn PDF document text
    • https://site-1084368.mozfiles.com/files/1084368/penaxefiwerax.pdfIn PDF document text
    • https://site-1252473.mozfiles.com/files/1252473/envato_login_templates.pdfIn PDF document text
    • https://site-1172077.mozfiles.com/files/1172077/41974998059.pdfIn PDF document text
    • https://site-1208496.mozfiles.com/files/1208496/axial_flow_pump_performance_curve.pdfIn PDF document text
    • https://site-1168131.mozfiles.com/files/1168131/21798734154.pdfIn PDF document text
    • https://site-1178049.mozfiles.com/files/1178049/botonojel.pdfIn PDF document text
    • https://site-1166603.mozfiles.com/files/1166603/musically_tik_tok.pdfIn PDF document text
    • https://site-1222001.mozfiles.com/files/1222001/fourth_grade_learning_games_free.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/zunaduxa/89479669538.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_off0000d1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EC 5632 bytes
SHA-256: 30e0c13b536edb7905c1721e4a1613a8509c60904ca0f1bda6cbabaedbb55dd9
font_01_sfnt_off0000e50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 10356 bytes
SHA-256: 027cd3270be964e48923d0279c8a8e4ea3d593fb6d6ce9dead25bbccf7c8691e

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