Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec19e23e33f50df7…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 14:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36f794727188571adffc30377c3de90b SHA-1: 8924e9d69aef3a44bcc5e0fbc7e0960d1371316c SHA-256: ec19e23e33f50df76413d738ed4885f69e42b74dc9f6bc5935b5f6a4442928cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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
  • 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://crysiq.ru/uplcv?utm_term=asterix+books+pdf PDF link annotation
    • https://beyondpins.com/calisma2/files/uploads/fusuzitew.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/93270049892.pdfIn PDF document text
    • http://ore-processing.ru/d/files/55988592344.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/pujanajisadajujufepexo.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/da761c664bd71bdf8b8bbb17e316d5b2/7122033628.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/59137318178.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/zilifapozal.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/67347935353.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/debedutodaxexoboge.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/pubisufanofixeguvo.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/34445248656.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/sekeruvisitozadotafa.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/62086498621.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/d22b13f2b2cb53f00411c8ab626af585.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/32807561091.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/wotozuzisetapeba.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/lunilitoxexaladititafepof.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/26595570668.pdfIn PDF document text
    • https://svilia.restavracia02.com/userfiles/file/wujilem.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/85111042707.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/nebenumuzavalezabolokob.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/49368937683.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73F 17316 bytes
SHA-256: 3b0569e57e5f25cfe6e2aef40258ecae34821268f9b8d9c1029f235e88ef0dad
font_02_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 10492 bytes
SHA-256: e1b8885814497c5b052efe73ceccebd8bf5ee05a87479eee567e2af5677e5a0d

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