Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3eb47b32f619ddd…

MALICIOUS

PDF

75.5 KB Created: 2021-03-09 21:30:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fb49d58fcd19081b17131beba4e4230c SHA-1: e9d996154510a6da17046e2c03c9354085a0cde5 SHA-256: a3eb47b32f619ddda34177a24e41c18132164226fc27a4eb2a3efffa57a4ae7b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous small PDFs linking to disposable hosting, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=american+racer+unblocked+games+66 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501989/normal_6019763a29bf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372361/normal_5fe49343ad7d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449172/normal_600e338c0fe6c.pdfIn PDF document text
    • https://cdn.sqhk.co/dedizozife/wshjaij/tiktok_star_drowns_in_ohio_river.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/jepSMic/35122164215.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460060/normal_5ffe99030a43a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462354/normal_5ffeec8571f2b.pdfIn PDF document text
    • https://cdn.sqhk.co/givujelised/bnKl0Ef/suwafegis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471091/normal_601c726a85174.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/sngficV/autodesk_bim_360_glue.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/fzbgijj/pet_shop_hd_wallpapers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457312/normal_600083663f7f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wemelimefudunej.epizy.com/used_husqvarna_61_chainsaw_for_sale.pdfIn PDF document text
    • http://xobuxadoxexe.epizy.com/advanced_dungeons__dragons_players_handbook_2nd_edition.pdfIn PDF document text
    • http://kuparego.rf.gd/chiefs_ravens_injury_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/mht_cet_2019_question_paper.pdfIn PDF document text
    • http://lesexugisitu.rf.gd/71867371193.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/54169341773.pdfIn PDF document text
    • http://ligafima.rf.gd/guwaxosikenobexoboma.pdfIn PDF document text
    • http://kevobupuwa.rf.gd/conair_1875_hair_dryer_reviews.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_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 5604 bytes
SHA-256: fc49b6df4a9c21e445c9139133d400bfdb12c355211403830cb8045d93c4ce93
font_01_sfnt_off0000fd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 10316 bytes
SHA-256: e846cc30895b73b275e5baae17a0fd9528a517431a7e3fa9d6fdc9d7067a8fc3

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