Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac41b8bcd0fcd5e…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 19:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ab6cc6ccd4a3bd44ef5c5404acd9f34 SHA-1: 912d82c87c3f85721876a1721a9c1be1bdb91ea1 SHA-256: 4ac41b8bcd0fcd5e33eaed5dee89b7d2db50f15ac7cf0a8427c518242e6ebaa2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that redirect to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute further content through these links. No scripts were extracted, but the structure points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://tcyy88.com/userfiles/file/2021090305245773499.pdf In PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/likapugobefa.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/79724567702.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/74441423160.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/womomutofi.pdfIn PDF document text
    • https://go2germany.ru/files/file/78330017038.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/6186290691.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613da6f3f16f5---96017721645.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/gesegaravefuguzivefogubad.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/wiminalesibineziweraduga.pdfIn PDF document text
    • https://funke.be/data/file/jekobuju.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130d96f7526a---texemanefizamob.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/sesinuju.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/21174387227.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/28657338546.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/xigosoguwedof.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/jomiritagejavoxefikoguma.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/1043739267.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/madozute.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/gevosafevazotozo.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/fuxufokinukorefiniwap.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/52500614613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=popular+games+android+2020PDF 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_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 17760 bytes
SHA-256: e36cb1283fb4ba9a86cf460be5611845c2f6a7f4902c5a5ed24e24d9481da6f3
font_01_sfnt_off00011464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7B 10980 bytes
SHA-256: 0e1ebc32afb9be294bab5f5433cdd4c494188792fd2a2bad2286489431d3df0d

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