Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0b9c100bc131fb…

MALICIOUS

PDF

68.7 KB Created: 2021-10-04 06:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1d8c0c7408142245cc2e8488a00d9267 SHA-1: 0947d4dd55e8fac7f4238ae143b64a05a5da46c3 SHA-256: cb0b9c100bc131fb5f9530dc01cbe54459e4f96e70355c25550ae0b3d4312291
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://constantemail.com/userfiles/file/16310080372829845216.pdf In PDF document text
    • http://goksirlambinowice.pl/img/upload/files/fojoxib.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/minelat.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/baxonevipomatux.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/bosowubol.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/wevavavaxorawafovavisix.pdfIn PDF document text
    • http://xn--80aer5aza.xn--80aai5amepo3c7b7a.xn--p1ai/ckfinder/userfiles/files/57388037585.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/23115182309.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/tulisovusilidawetoja.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109080409506261.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/tedaxewopovugiw.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/tijawejuwimi.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/25674810684.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20211002220905.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/wiwopinogefisudewoxomik.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/takenemopi.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0bf867c24---zaxexur.pdfIn PDF document text
    • http://khocabien.com/uploads/files/somuboditozerad.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1632743585.pdfIn PDF document text
    • http://zenithmetals.com/files/sajelawixul.pdfIn PDF document text
    • http://btfa.tw/upload/files/getobekedivigigobifid.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/75163037834.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/52768938219.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/11420933278.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/denavuxona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+rational+number+between+3+and+4PDF 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_off0000b033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB033 10884 bytes
SHA-256: d72737593ecae9c35742896a3e500cbda989624100c0db7b3c79c6d2fb1ec1ff
font_01_sfnt_off0000c93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93C 14328 bytes
SHA-256: 20b4633604e74ca34dd92aa589a66b0b6918b22bd64f5b89d0c80423de5e3af3
font_02_sfnt_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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