Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d621ab20c66ac5…

MALICIOUS

PDF

92.9 KB Created: 2021-02-20 05:19:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7bd481e0026ac2ecf05411f154620b94 SHA-1: 4101797eca8dacd335ba4060afea404e509a50c0 SHA-256: b8d621ab20c66ac5f215c2f499a494e2d61b822c364d0b0e88d3cbcd19f6343c
126 Risk Score

Malware Insights

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

The PDF document contains an embedded URL that redirects to a suspicious domain, disguised as a search result. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of external URIs and the link farm heuristic suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=what+is+fluid+dynamics+in+maths PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452594/normal_6028c280930f9.pdfIn PDF document text
    • http://winclean-shop.space/words_in_a_pic_level_10660uy33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497370/normal_5fd27ddcc273c.pdfIn PDF document text
    • https://vebaxifi.weebly.com/uploads/1/3/4/3/134360040/4915464.pdfIn PDF document text
    • https://cdn.sqhk.co/wugeguxu/5jg0gjI/hourly_weather_forecast_for_tomorrow_morning.pdfIn PDF document text
    • http://bigops.fun/teach_like_a_champion_free_downlcq88n.pdfIn PDF document text
    • http://irisca.online/groomsmen_speech_templatez24tb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5fd1368da69de.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/eiehiyg/my_talking_angela_hack_apk_mod_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444378/normal_5fec01b6bf9f9.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/8jbhija/26949320266.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/ehahDic/jugisevigepuwubuj.pdfIn PDF document text
    • http://bestita.space/sonapemisegikugrcv8l.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxiniraz/Bhghhji/nusogudivujo.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/womirofop/nosodasibigugajamepipini.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/family_budget_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/comilla_board_hsc_result_2018_marksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/texoxuminokepof.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 5280 bytes
SHA-256: 86c8410e0d054f8d4f0f33d93bf479a547eb5b00f0fc95f2608320a6e10cf683
font_01_sfnt_off000127fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FB 11992 bytes
SHA-256: a8428a1d722e49401ccce3407e7bebf4451593ae82d1a0c9503c0dec1c2e4e34
font_02_sfnt_off000150f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F4 16232 bytes
SHA-256: 25b3cfd1f7477cefbde28d4596df5fcb3087e9cf1287306b6de78dec02ea3627

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