Malicious PDF — malware analysis report

Static analysis result for SHA-256 62859231b6939d50…

MALICIOUS

PDF

73.8 KB Created: 2021-02-27 01:56:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0f24e192817dc6b95118b23176112d1f SHA-1: 326605f08ae2f53ed6777140a1babccd4a8c2006 SHA-256: 62859231b6939d500e0b434b3c074fb06f0a922604515af3f461c6828d26f4b1
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting it's part of a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to a chapter summary, aligning with spearphishing tactics.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://dugedepap.ru/wb?keyword=toms%20coons%20mulattoes%20mammies%20and%20bucks%20chapter%20summary PDF link annotation
    • http://wewogokuwidu.mywebcommunity.org/38296842186.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472185/normal_5fdd0bf49c8eb.pdfIn PDF document text
    • http://contentmedialiteracy.com/wrecking_ball_miley_cyrus_chords_piano1qdbk.pdfIn PDF document text
    • https://cdn.sqhk.co/tetaxekumipi/hgdxQgg/yellow_white_pages_columbus_ohio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_60269e542f5b6.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/FlBtChh/feudal_japan_military_hierarchy.pdfIn PDF document text
    • http://mignonette.space/kaiser_permanente_pay_login5etf9.pdfIn PDF document text
    • http://gloslides.com/matlab_plot_marker_color_fillxfhgd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380413/normal_6021959864777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500667/normal_60260d693d4c5.pdfIn PDF document text
    • https://cdn.sqhk.co/toxodimina/gi0Puhd/solar_smash_online_unblocked.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/guide_for_free_fire_booyah6m5lj.pdfIn PDF document text
    • http://drilltech.info/290828560628bz4x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuputes.atwebpages.com/beowulf_and_the_critics.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/titus_andronicus_movie.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_off0000e22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 5568 bytes
SHA-256: 1471fa622af3fa2d3d9a6023d00ddd95859b40e125aab61ba453d8585d7c9677
font_01_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 10908 bytes
SHA-256: 9b3e40b2fd75a58f4287e77bc3a1669536ecdf044f2721fa07bb5dbc2713c8ff

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