Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7817e86ddca79b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 20:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e470dad5a0ad4af3bc1e2ba686814e0f SHA-1: 68ee7fc5676b5792ea9f8d52bf50385e59011e5d SHA-256: 8e7817e86ddca79b36f357b05cc2e89cb6c7c2bf040d3bde09e221bcae360ac9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smidgel.ru/uplcv?utm_term=free+download+reface+app PDF link annotation
    • https://ietc-oman.com/userfiles/files/97507665602.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/799647361.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210913_588DABB891A66079.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/31968536637.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/vigazidigewu.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/tukobevakew.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/gagomopogujid.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/pobemitipolijexuresoxat.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/gerexulora.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613676ecf2870---2294288780.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/bawubibamirefero.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/kefetolopitez.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/19854497767.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210907024827.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/50975583548.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/lexizas.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/91093914850.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95kmn44ocokupqnapntf0c1l14/43083391875.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/91001643535.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/levitobuxiwenuxu.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/tinag.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/xesuvinuxelivopisus.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/dekolevupedasidetitemape.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/7164037052.pdfIn PDF document text
    • http://cartopack.be/Images/file/gugexadijuzutajasepapid.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_off0000d5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B2 18040 bytes
SHA-256: 064e2547af66284e451997d46acbc03011717d71893bffb8104e6a25cc15c430
font_01_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C86 10320 bytes
SHA-256: c01e8c0a23e00f19bd4f114e06883705c0388881104fc66234ce1f2fafdf7270

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