Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f02fcbc905990f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 05:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11d065f370d3d79c993541c70cb0d05b SHA-1: ea03c76975ddd95869e9061857f5d3b3c525bf50 SHA-256: 57f02fcbc905990f93a5d6771d42a28f6d2f8becac88bef27ed45909db2be703
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to external domains, suggesting it's designed to redirect users to potentially harmful content or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://garglob.ru/uplcv?utm_term=what+system+apps+are+safe+to+remove+android PDF link annotation
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wamenitaretepaba.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/dagekumaze.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/naxilopebevol.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/99652535432.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/36639812365.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0i5a81bvmug3sj0otob606sh5m/dusajuroviperu.pdfIn PDF document text
    • http://innotack.com/userfiles/file/xodozagex.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/tonajikizetesoj.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/1907330593.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/madanepifagexabikukibara.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/12374960411.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/kadefetiruwotopawizovasi.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/46410064985.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/sanexofixevatumu.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/xilotobuwu.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/4717926213.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/44787498414.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/fupaxej.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/21288178415.pdfIn PDF document text
    • https://ebooksweb.net/files/file/sosusosiwipuza.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/27478569871.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fiwemox.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_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 17572 bytes
SHA-256: 9ef46835cadac2b5ef5e965eb9bec1aebe2424b8788b419b36a9a537b0f32e30
font_01_sfnt_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 10892 bytes
SHA-256: 937d87620016aaae8381ae14872a0b6b14658e22310d91fa57861ab45baa192a
font_02_sfnt_off00012928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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