Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fbfb13a3b31ee0…

MALICIOUS

PDF

68.7 KB Created: 2021-06-10 03:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 049471d972fe70827188de5fefcbbcbc SHA-1: f5bd97203b31175601e6317760d30b95191cc6ff SHA-256: 50fbfb13a3b31ee029f957215ccda68cc3f90250903c91312d81eb43de91bb8e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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
  • 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://krisoc.ru/pbw?utm_term=dual+audio+movie+downloads PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410414/normal_604e391066135.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489969/normal_60055614c6e2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_6041f3365df00.pdfIn PDF document text
    • https://jotutavujisab.weebly.com/uploads/1/3/1/1/131164129/bavebeb-gorapomifopage-pomufetawiw.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4488346/normal_60b6dc268a9a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384482/normal_600e480583f7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493881/normal_5fda7526a06cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387924/normal_5ff32adb41c46.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/modisisipi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://degenazi.pbworks.com/w/file/fetch/144770796/how_to_write_an_email_for_university_application.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/f/lapufemapatowezijirix.pdfIn PDF document text
    • http://fuxijovipa.pbworks.com/f/offline_mobile_legends_mod_apk.pdfIn PDF document text
    • http://wodupabizel.pbworks.com/f/bluffmaster_2005_movie_download_300mb.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/w/file/fetch/144822828/remoketidabef.pdfIn PDF document text
    • http://rumusapage.pbworks.com/f/what_is_tuckmans_group_theory.pdfIn PDF document text
    • http://paditoxef.pbworks.com/f/converter_para_word_gratis_baixaki.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/gavuxebudejanoluxazodi.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/f/62566167629.pdfIn PDF document text
    • http://patuwit.pbworks.com/f/67921507371.pdfIn PDF document text
    • http://lezakoliz.pbworks.com/f/logan_telugu_movie_download.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_off0000d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 5024 bytes
SHA-256: 80c12400b99d8bc12c827ece6260028582fb8d8c484b36d009434f89b99e2e67
font_01_sfnt_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 10120 bytes
SHA-256: 03c34df15edab94fb985909c2f72a119b771150139ef7bec0b40071905b51e0e

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