Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9f10ec72a3f79f…

MALICIOUS

PDF

74.0 KB Created: 2021-02-23 08:24:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: da466d990661cabddc68fef5bed05cf2 SHA-1: 17f28395589b8b9c9a8c6a9ed96ee6cb9232ffd2 SHA-256: df9f10ec72a3f79f5f2e579898b9282d4425733dc79ba38d567a675e3b91f11d
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified suspicious links and a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://seumenha.ru/strik?utm_term=does+the+sweat+app+have+at+home+workouts PDF link annotation
    • http://ig-supportcenter.xyz/cash_drawer_count_sheet_template_freeuzswe.pdfIn PDF document text
    • https://xukonixivuki.weebly.com/uploads/1/3/0/9/130969652/4645b925ac.pdfIn PDF document text
    • https://fuwiposodunumof.weebly.com/uploads/1/3/1/4/131438128/sipuzeboxorawugesav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462350/normal_6005c97605785.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/libawowurala_xenikexopikugu_kaduputofofibab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_602be48a7753f.pdfIn PDF document text
    • https://cdn.sqhk.co/tawumemikuva/nCHkjas/land_rover_defender_interior_upgrade_kit.pdfIn PDF document text
    • http://pink-echo.club/formel_1_heute_live_skygmvkk.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/ieahhbt/unicorn_free_icon_packs_ios_14.pdfIn PDF document text
    • http://topcreditcheck.info/nupujaxixopevijujstalm.pdfIn PDF document text
    • http://numberoone.xyz/how_to_add_effects_to_multiple_clips_in_premiere_propk97l.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxovunevo/XfqXX7D/bed_wars_server_ip_1._8._9.pdfIn PDF document text
    • https://sitekitenuzuvi.weebly.com/uploads/1/3/2/3/132303150/migilowo.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/95815431281l6lmu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A0 5240 bytes
SHA-256: 19bca8308157d271e6f47702fc5e44d50e6ecc2cf4cdbee0ca7925db1ba04fa1
font_01_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 10672 bytes
SHA-256: 64f6dad1b606ddd73c0be997132e1e5729e55ea24fe4ea3840e3b430636c54b9

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