Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc746c1a6fcacd7…

MALICIOUS

PDF

75.0 KB Created: 2021-09-14 11:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 47079f28354d5657a3b257b2c59bed15 SHA-1: 30e46b1c3b4c4f5d5f22b3992b9de225d9d1d322 SHA-256: 7cc746c1a6fcacd70477113de6f6bb70416e185176e69cf256d616e6368dee5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown domains, suggesting it functions as a link farm or redirection mechanism to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ldoris.com/upfile/files/20210907170019.pdf In PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/wumitidevuvajuza.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/vafivazim.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210912000736.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/kukugojaburagugowotepeg.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210907000513.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/zuvidusirelirewigetotureg.pdfIn PDF document text
    • http://4darchitecture.org/img/all/65192841472.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/fajitiwepijuf.pdfIn PDF document text
    • http://vladekoservis.ru/files/dunukedexefawaxifaban.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210906230112_247615173.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/kutok.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/segamapunexas.pdfIn PDF document text
    • http://millecolori.it/images/file/47980036641.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/26446343626.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/80421639571.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091400585273499.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/94045973503.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/31150433888.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/91369002137.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/kejuwegivawasikutuge.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/40735158998.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/xasesinelujemufumavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=enlight+photofox+androidPDF 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_off0000c2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC5 10564 bytes
SHA-256: c9a08231555a3bd5aa2ca33f63af7421912c8abc5bc64033a55c6478f37a2040
font_02_sfnt_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 17036 bytes
SHA-256: 40d073a310839a15107bdb821d972485130c1ba9d59013ec3c86f23884dcb48f

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