Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b819c8c9fef6c3…

MALICIOUS

PDF

70.2 KB Created: 2021-10-01 10:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bb1603816d3d2f5fb68d795e0d1ca210 SHA-1: a4accabd5e010d9f5c6d3f79dd50748c0dc6d817 SHA-256: c8b819c8c9fef6c3f8e4df53bca10814b7e3fa0bf4a7650adf40a904092d7dc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded links, many of which point to unknown PDF files hosted on various domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613702436d2e7---naxusojakisulize.pdf In PDF document text
    • https://widepolymers.com/userfiles/file/nibemut.pdfIn PDF document text
    • https://aneri12.cz/res/file/tadipekokix.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/litifizaboworetamijen.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/jozusidijudexurur.pdfIn PDF document text
    • https://asi-filter.pl/files/file/53353739998.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/64559899737.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/rasubaximak.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/lifuridumuwowe.pdfIn PDF document text
    • http://rc-modeller.se/images/file///bekugoganariraloligele.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/gokuzizij.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/49028589306.pdfIn PDF document text
    • http://korytnica.net/data/files/1502654744.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153d45ddba24---wutitefalevalejagorodi.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/kuwuvoworedawi.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/93798546465.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/jonil.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/26629094814.pdfIn PDF document text
    • http://ebus.cn/up_file/file/98916834953.pdfIn PDF document text
    • https://gdaniec.com/upload/files/pamatuw.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///witegigala.pdfIn PDF document text
    • https://adikkedua.com/contents/files/jedek.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/78635239408.pdfIn PDF document text
    • https://istanajp.net/contents/files/bijopotazifoju.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/pobusezowulixus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=autocad+2016+free+download+with+crack+32+bitPDF link annotation
    • 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_off0000b08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89D 15608 bytes
SHA-256: 6cc17ec537f891496e59360d544c07e46de4135ab48f12e36eb5466b7411469d
font_02_sfnt_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 11440 bytes
SHA-256: ef2c97e7c1e091d26e0ccb8a8629cbcc1ba892f90389da870f7a0c9a366ca64a

Open this report in the interactive analyzer, or submit your own file for analysis.