Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c73a1ccbf829a6…

MALICIOUS

PDF

80.8 KB Created: 2021-01-21 08:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 59b52a53a69186566dab6f08055723fd SHA-1: 71d18f37e08a746e7de940e264b4326ede4d5638 SHA-256: e7c73a1ccbf829a67e0b3d0c45a3db771c8d5e31691ce7743ae1c7e87896e5ad
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file contains numerous embedded links, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs points towards a phishing or malware distribution scheme.

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://ggtraff.ru/123?utm_term=why+does+he+do+that+pdf+reddit In PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/41af25f862.pdfIn PDF document text
    • https://site-1178096.mozfiles.com/files/1178096/berg_balance_scale_scoring_sheet.pdfIn PDF document text
    • http://xotizel.iblogger.org/ziregofuwamodimimunuve.pdfIn PDF document text
    • https://site-1173675.mozfiles.com/files/1173675/ligulu.pdfIn PDF document text
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/gexumotife.pdfIn PDF document text
    • https://site-1249599.mozfiles.com/files/1249599/free_envelope_template_printable.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/fowodakavepeza.pdfIn PDF document text
    • https://kibalenujodoziz.weebly.com/uploads/1/3/0/7/130776895/dujefutofanigo.pdfIn PDF document text
    • http://fusobilel.iblogger.org/zevivodex.pdfIn PDF document text
    • https://site-1166051.mozfiles.com/files/1166051/solution_of_oblique_triangles.pdfIn PDF document text
    • https://mixenabunagoxo.weebly.com/uploads/1/3/5/3/135320093/vitokanunasex.pdfIn PDF document text
    • https://site-1171990.mozfiles.com/files/1171990/xerukafomu.pdfIn PDF document text
    • https://site-1247725.mozfiles.com/files/1247725/l_s_theme_clarinet_sheet_music.pdfIn PDF document text
    • https://zubowosusotikip.weebly.com/uploads/1/3/1/6/131637009/rupexodelu-megulobol.pdfIn PDF document text
    • https://site-1173509.mozfiles.com/files/1173509/barnyard_gamecube_rom.pdfIn PDF document text
    • https://site-1216881.mozfiles.com/files/1216881/sobitogijikes.pdfIn PDF document text
    • https://site-1168500.mozfiles.com/files/1168500/drive_in_movie_theatre_nyc.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/tetofamuxulil/cyclohexane_boat_conformation_point_group.pdfIn PDF document text
    • http://soxomidil.epizy.com/99067637356.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_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 5212 bytes
SHA-256: c63edacd69175e3b03d0aeafa2b3ac51322aa21146ca4971cdd26cf7c6933332
font_01_sfnt_off00010f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 11244 bytes
SHA-256: a055adf876c2339351362a56ba1e7d060a275a14092639bcc6ceedc0022a5746

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