Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b708e86eb9efbd…

MALICIOUS

PDF

77.0 KB Created: 2021-04-30 00:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 94410b808d7f6bc8b87fa191efd14b7d SHA-1: 7200f5467b50a3f89e3a7302b55fa7c630e9b1a6 SHA-256: e1b708e86eb9efbdd61a8c67c6875b8064066d17560a0ccc22652c1fb89ad01f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=bosch+dishwasher+silence+plus+44+dba+won%2527t+start PDF link annotation
    • https://cdn.sqhk.co/vinogusi/diahdgh/14917423018.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/eiagfhl/33126632323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_601d2bcd17755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_60160cf372d37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_6057c26ba1990.pdfIn PDF document text
    • http://toladidiripe.iblogger.org/why_is_my_wii_light_red.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_602c4693d691b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_60494c9c51bec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484821/normal_6051a0f03854f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413125/normal_5fe86b0568805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_603e468a01f3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_6029427685281.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483602/normal_5ff8fb4b54a40.pdfIn PDF document text
    • http://nenusarawamis.22web.org/ill_be_there_to_save_the_day_superman_has_nothing_on_me.pdfIn PDF document text
    • https://cdn.sqhk.co/dakizenewa/gfcOyjh/babitipevovanufoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6fc76513-a17a-4053-940d-bef108f5ea85.filesusr.com/ugd/3a5ef0_ed59cddfe03447278964b3860e25a811.pdf?index=trueIn PDF document text
    • http://guvawegudisow.epizy.com/spring_acrostic_poem_template.pdfIn PDF document text
    • http://pitovevewapa.epizy.com/data_structures_and_algorithms_for_java.pdfIn PDF document text
    • http://vutevesofu.rf.gd/50412269597.pdfIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_e2e04cbb44b842c58db559fb26a1ab01.pdf?index=trueIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_6128ec448e144e8ab4cad86f68f1dd2c.pdf?index=trueIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_f1bdd91fc43e48978f736888f8b4de69.pdf?index=trueIn 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_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 5564 bytes
SHA-256: 68b5de53690f1086ae4a9ea03017ddcf41cc8e464c4e4eedf57d29c0d58b2bc5
font_01_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 10972 bytes
SHA-256: 95c8b4789636560ab9ebfc00d45b1574a9c602e1a1f92a5cd4b3f490064a895a

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