Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05af08bed2f4067…

MALICIOUS

PDF

170.8 KB Created: 2021-01-22 10:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 774d78d4a5f3adf32f20c04e1aa6bb22 SHA-1: 98dcd9aa5b8298151dcc96b4a797abd511de3472 SHA-256: f05af08bed2f4067df1a6048224dd6badea9968aff0ba77ee8be14a9eac83383
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the heuristics indicate it functions as a link farm on disposable hosting. The primary malicious activity observed is the redirection to external URLs, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=plato%2527s+republic+pdf In PDF document text
    • https://site-1175166.mozfiles.com/files/1175166/south_park_super_adventure_club_real.pdfIn PDF document text
    • http://xinupavob.iblogger.org/free_english_learning_audio_books.pdfIn PDF document text
    • https://cdn.sqhk.co/fisejadiruw/c3jeNMf/mineral_water_delivery.pdfIn PDF document text
    • https://site-1257458.mozfiles.com/files/1257458/74190612379.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/UjecV9H/kung_fu_fighting_cee_lo_green_audio.pdfIn PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/nazimutubeduv.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/gcihMks/candy_cane_christmas_2020.pdfIn PDF document text
    • https://site-1214630.mozfiles.com/files/1214630/zesodepakolet.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/M8jQqhj/xbox_360_controller_for_pc_price.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/woxorojero/75553191754.pdfIn PDF document text
    • http://magivuxitafexox.rf.gd/artifex_mundi_gry_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24BCD 2888 bytes
SHA-256: e9d55b5e86c1eab945b883015d6fe08b0d45ae8ac074f796367d9724d0121b78
font_01_sfnt_off00025611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25611 5324 bytes
SHA-256: 49af7f045faff4111ad83df847d39890c98d0e03dc1a641cf0d6d74f7df9f1b5
font_02_sfnt_off00026838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26838 17948 bytes
SHA-256: 6c9ac26e11f9c49b90f278f320f895a1a3b7944ed8b2fb9950a0b5674ff99fe0

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