Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be8635a047889a9…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 22:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 60e82d481e7f85d1e0860c912ce96b96 SHA-1: ed67680425ce5f35dec1894c5d8be6beada6b6e2 SHA-256: 3be8635a047889a991a867fc49b74a31cee68bc3ef6a0d97ffa08d2554c4d58d
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 embedded URLs pointing to external websites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating the PDF is part of a link farm on disposable hosting, likely to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=the+billion+dollar+secret+pdf PDF link annotation
    • https://ceiling.holcom.vn/webroot/img/files/17265848034.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905131121.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/dofim.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/vokakixanivilekozepemapox.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/84502705651.pdfIn PDF document text
    • https://kawanmto.net/contents/files/ziguse.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/20108562422.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/davolezerupu.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/zajisejakozagagezedufeku.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202193925394639.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/56292457432.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/nakomebevofabixe.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/likuf.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/javilekelazo.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/31820353646.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/ramewadusogogonupe.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/72703711968.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/banenalixerufita.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/62984610981.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/fodozazokaxepu.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/95392122204.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/nemiwisoluxolikekubob.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/85637631907.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613a96819dac2---67668071270.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_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 18468 bytes
SHA-256: cbaef77609c67f5457fc636b4954b77234f85771e724ec1f861fa4468b52cd0a
font_01_sfnt_off00010bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E1 10820 bytes
SHA-256: 6f194712a61cc31cee3acee942f289389eb02588cfc6cb571a8df31a228a4257