Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3461f7d329d2cfc…

MALICIOUS

PDF

73.2 KB Created: 2021-10-20 20:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 03bef54afbf05462929068f59ed534b7 SHA-1: fb598e64d1aa04524a27a5005761309cc8c1e97e SHA-256: e3461f7d329d2cfcbc0547b469f9ac2dc0d4c84269d09060d53c9a48cdb1297f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://kaiyudachem.com/filespath/files/20210919171044.pdf In PDF document text
    • http://ichieh.tw/uploads/files/202109151624493284.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/mofolerewubedi.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/sufarera.pdfIn PDF document text
    • https://absoger.bmv-communication.fr/uploads/files/55162166860.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/letap.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/tijotevubino.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/72535584975.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138a7620c9b0---nolavasu.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/72250325283.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/45821950411.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/96588962348.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/66006730712.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/wiwomin.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/2a1db4a397b1728069e27a93efa25766/70073870831.pdfIn PDF document text
    • http://ilkemymm.com/image/files/kexezimasevokaxi.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/77897812898.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/zagexowuzuwuvojirufadidis.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/zudowuwibibujuli.pdfIn PDF document text
    • http://contelex.it/userfiles/files/6510747542.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/deninusewejakil.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/vItLtdF7Pec/uplcv?utm_term=crazy+romance+full+movie+with+eng+subPDF 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_off0000b5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CF 11380 bytes
SHA-256: 3015084ba7231b1eb939923b4f93ce77d8f3c586e739fd822815e4da7c357795
font_01_sfnt_off0000d09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 17972 bytes
SHA-256: 27d5e59e9a70b750b0f728caf940212ef5158725e45a070d90c3d5703e7c80a0

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