Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b8b3f2f70f198b…

MALICIOUS

PDF

159.7 KB Created: 2021-06-02 12:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b42781e61ef776d97bd45f1520705aee SHA-1: 792c21f83dd88ca69d46cda07d65d0a47cbeee81 SHA-256: 53b8b3f2f70f198b3f60b1a59294e8981e087bd20e85c2a16580f35d8f0af340
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms and disposable hosting, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9664

Heuristics 4

  • 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
  • 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://ketchas.ru/pbw?utm_term=o+que+significa+cosmologia+e+antropologia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426080/normal_604ce13049cb0.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4424347/normal_60b3bd845d05c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_6057b0fc018a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_606356450d270.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476766/normal_5fcbcea710b33.pdfIn PDF document text
    • https://zatikavetix.weebly.com/uploads/1/3/2/3/132303242/pesupese.pdfIn PDF document text
    • https://pewovejike.weebly.com/uploads/1/3/5/3/135319851/c46b406cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387412/normal_5fd6884e0c6d6.pdfIn PDF document text
    • https://nodopemewave.weebly.com/uploads/1/3/2/6/132682748/4312732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479237/normal_5fd1293e8979b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443372/normal_606642f86f3a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415531/normal_6030d9973cb80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://katafuzum.pbworks.com/f/advanced_potion_making_book.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/17th_anniversary_color.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/w/file/fetch/144465618/zagebujosixisizufuwiruzo.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/f/60138107365.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/street_dance_of_china_season_2_winner_mentor.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/f/cleveland_abduction_2015_full_movie_download.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144413181/38320761054.pdfIn PDF document text
    • http://finebov.pbworks.com/f/bopuvetisabutetilavoj.pdfIn PDF document text
    • http://savavaze.pbworks.com/f/dayz_standalone_free_download_full_game_pc.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00025ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25CCC 5488 bytes
SHA-256: 1bbae525e72798195be0b4b9504f2230d247c3a20c39e3bde909e7e0a302d35d

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