Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e8c43ee489f06c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-22 12:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6935ed806c3d5b51279a2925b3c5ff41 SHA-1: d458da09c1c66646dc48f140e61bdd9418c24f7b SHA-256: b8e8c43ee489f06c33701342a05ab73e20cfdc8c0be75942b08e5c4d04c3b88e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the ClamAV detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://urotunisia.com/uploads/FCK_files/file/gikobev.pdf In PDF document text
    • http://elmbbq.com/uploads/files/wulegeripobosuxosapofegin.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/42115849014.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210911032357.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210903044731.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/13341200008.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141e13ec17dc---77959899293.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202109177168_501521447.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/65197752126.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/kujiwizib.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/fivafutemosiwidoru.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109161319296494.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/39201146785.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/99801614280.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/posazizodaxafafur.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/zalufezumixevijirolitan.pdfIn PDF document text
    • http://ud2-140.com/files/77053064544.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/43628650955.pdfIn PDF document text
    • http://sissonne.hu/editor_up/644546508.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210907062002.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/62032926635.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///50667003761.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/verupadaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=canterbury+tales+prologue+modern+english+pdfPDF 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_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 17416 bytes
SHA-256: 413aad511420109abf3f92a460788e4fb96bb483400a9b90b02139479ff24697
font_01_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 11328 bytes
SHA-256: 968ee107b77ef994e6a7769fa322ca33c82f9bd26f47a1019f48f046d92a3947

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