Malicious PDF — malware analysis report

Static analysis result for SHA-256 d387ce9a7aaa5696…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 12:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bfa9d865980ae9cfabe248f48458d8bd SHA-1: 9d55088803fd9016e457ab9101beee2aa0a4bf3b SHA-256: d387ce9a7aaa5696778149de17db7779295996074d293c70eddcf684b5aa2b4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature. No scripts were extracted, but the primary attack pattern involves directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://smidgel.ru/uplcv?utm_term=scary+words+beginning+with+f PDF link annotation
    • http://irollee.com/userfiles/file/wejaro.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/puzafoboviradofilobumisez.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/geramunanavibe.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/11648266356.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/82026474441.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/xawufoxagafujogakise.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4b698d4b7---37596655252.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/saxixilupilomigezulexerot.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/34684174253.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/wekobinukaxupiragis.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/37811407147.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/sapuxamagogipojipogekowad.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/73350667100.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/94441344054.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/samiridovufopatujizomu.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/31469700262.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149be70d8bbf---sugez.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/latozolusi.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/52903270841.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/pugixitowokakoxumobex.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614daddd64747---497575842.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/wusulal.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/79119269586.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/89570412487.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_off0000b02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02C 11124 bytes
SHA-256: 991f8e2fcab1a8f56abea1c1904e2d176e1dfa73e5a5246e78bf485ec0a257aa
font_01_sfnt_off0000c9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 15328 bytes
SHA-256: 1a29450a9c9c7e078154411e60d3aac6b217309d204787cb31919d707749a06e