Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79acf7625605a9f…

MALICIOUS

PDF

79.3 KB Created: 2021-03-24 15:09:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6a2af3430ca8b96af811007373c48674 SHA-1: d713b9bbd8687612cfa15ca8986594bb9d90b71c SHA-256: c79acf7625605a9f667b40356efd14d4d6879ff327100f4f004990a52614c07e
156 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 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 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.
  • 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://golowaki.ru/strik?utm_term=how+does+a+rudder+work+on+an+airplane PDF link annotation
    • https://zunarorukozem.weebly.com/uploads/1/3/4/0/134016655/a4b65745.pdfIn PDF document text
    • http://wigosixozem.mywebcommunity.org/nekufabagapagufel.pdfIn PDF document text
    • http://fevofawemuwa.medianewsonline.com/palmistry_books_download.pdfIn PDF document text
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/3555464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383802/normal_601a394f173ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375080/normal_6036301465cee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_601dcd43ad5b4.pdfIn PDF document text
    • https://bejixetixozivi.weebly.com/uploads/1/3/4/4/134499198/vobikerafefigezane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412780/normal_6009380fde1a8.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/adam_savage_book.pdfIn PDF document text
    • http://boketizabujig.scienceontheweb.net/53535134147.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/98532138199.pdfIn PDF document text
    • http://xalapuzim.sportsontheweb.net/sharpened_romberg_test.pdfIn PDF document text
    • http://nunovoxiwanafuz.getenjoyment.net/chinese_dictionary_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417814/normal_6043f8679949b.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/jinabisura/clinical_practice_guidelines_gestational_diabetes_mellitus.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/77636584889.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/ic-706mk2g_programming_software.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/waterpik_black_cordless_plus_water_flosser_wp-462uk_boots.pdfIn PDF document text
    • http://vulopekusape.atwebpages.com/93671607741.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/acrobat_reader_free_windows_7.pdfIn PDF document text
    • http://kesolimasakifi.myartsonline.com/usmle_biochemistry_questions.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 5072 bytes
SHA-256: fbe83b279ad388b071738015320c29e8b363085f3d8c7d8bbd451e4d92dbd47c
font_01_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 10940 bytes
SHA-256: 4238fa6ab8c81cebd5b627616f0de7c4c1fc953af660fac444c9d4a1c747304c

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