Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21759dd3352ab1d…

MALICIOUS

PDF

72.8 KB Created: 2021-03-24 18:33:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2aba9e3f20bb30a2bc5dc1673d7f49e4 SHA-1: 19a37ab74e7be15245eee5c10df8e54be78705d0 SHA-256: b21759dd3352ab1dc7f085b8c9362ee365733bdd94504deb8aed124d3f5d8f71
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs as link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9671

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://xezojetit.ru/wix?keyword=types+of+chemical+reactions+worksheet+with+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417997/normal_5fff01c0a6a60.pdfIn PDF document text
    • http://wavolat.iblogger.org/78240279247.pdfIn PDF document text
    • http://lamanixumerad.mypressonline.com/abstract_reasoning_exam_with_answers.pdfIn PDF document text
    • http://pemutoguxo.66ghz.com/star_trek_discovery_season_3_episode_4_cast_imdb.pdfIn PDF document text
    • http://re-prime.ru/169772187180hpoh.pdfIn PDF document text
    • http://beautysss.site/1168282307bxwfv.pdfIn PDF document text
    • http://tehnotop.store/facebook_app_install_free_mobileicb6m.pdfIn PDF document text
    • https://ruwuragawani.weebly.com/uploads/1/3/4/3/134383911/kixaseg_jurajiwupolitab_filenapowivok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_6055a07e2b7f0.pdfIn PDF document text
    • https://xefakiradu.weebly.com/uploads/1/3/1/8/131856624/8e6462e63455caf.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/fifadididexifo-gevoxef-juzidov.pdfIn PDF document text
    • http://reabook.online/panasonic_cf-53_toughbook_drivers3cjp8.pdfIn PDF document text
    • http://koolmaxt.online/bulezazuwixumusidoxizu9ljjn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ludugatitabi.atwebpages.com/51814375354.pdfIn PDF document text
    • http://gejulakan.epizy.com/bfg_movie_in_tamil.pdfIn PDF document text
    • http://sikofus.epizy.com/delaberasawumi.pdfIn PDF document text
    • http://gekolutewubel.myartsonline.com/mizosorivig.pdfIn PDF document text
    • http://besafetusupug.atwebpages.com/habitos_alimenticios_mexico.pdfIn 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_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 5600 bytes
SHA-256: 82222e632b17a4dec6afc8e986eb88d2c3845145473f07348b837cbebabddfb9
font_01_sfnt_off0000ffb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB8 10456 bytes
SHA-256: 4d7826d08f3e515cf0ddd409ccf9fa93bf5e2442bab378bb0f3f136770de90b8

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