Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8afef6d4767c4c…

MALICIOUS

PDF

68.6 KB Created: 2021-09-19 15:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f472e964f4a7975c4b0cf13ff109bb14 SHA-1: b061e62e25d164fb1cc57fff8256067a1d09c83a SHA-256: 8f8afef6d4767c4cd89ebe24b3bbb1ba52c3b8284a1f0b84e670766a6393f09f
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.ville-dammarie.com/ckfinder/userfiles/files/44454625210.pdf In PDF document text
    • https://shopinhome.com/ci/userfiles/files/85578229287.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/42039939002.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/pawivobu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134e8867dbaf---60438734512.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0b79db68e---15123229733.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/wararoxikewisi.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/43651783344.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/wivalafarodez.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/79545078044.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/mafotegoluwurudap.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/sivobivorirukojepalaj.pdfIn PDF document text
    • http://palami.by/images/file/lifometomufuf.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/witekapotonej.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/21253899857.pdfIn PDF document text
    • https://eklyps.net/images/file/sexowenejizojuravika.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/26404521667.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/65807976905.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/90493982253.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/69043172380.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/1965407213.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/52742620713.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/80257729710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=c%2B%2B+primer+5th+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_off0000b17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17D 14228 bytes
SHA-256: db7cf1d69167e0926a43ac11b04ff7d2ab1d1a9a2fd1de00e8be043526fe69a1
font_01_sfnt_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 10328 bytes
SHA-256: 120c991bf461d8c29a17d56fdcb7b27b613db4ee83a02554cf4e9fb5d889a19c
font_02_sfnt_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1