Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b7f9d35e4320bc…

MALICIOUS

PDF

88.0 KB Created: 2021-09-14 02:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc3b785bc386b9b7c4857bda62e90227 SHA-1: 265f631b128e77828b269cac61d3e38fad25fc3c SHA-256: d2b7f9d35e4320bc5f4481b09ab520de692efed493719b75cd0f4a55648b4a6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a potential attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://nayyaralidada.net/alpha/ckfinder/userfiles/files/jaremavalivibetiwopid.pdf In PDF document text
    • https://planet-pvc.com/upload/files/zulenigezevejuwan.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/80598206023.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/fatikexizadofamabiripog.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161305c80e6c11---wosabaruxojoraru.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/lonawawifumowudiwot.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/rusazupewedelurarixopanel.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/pozagemexovijonasuvoba.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/10172178623.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/83187203272.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/79955976374.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/36730258711.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210907001329.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/56903547115.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/12344739142.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/15561853130.pdfIn PDF document text
    • http://bjjiffy.com/upload/56116649768.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/71039407663.pdfIn PDF document text
    • http://scsychem.com/upload/files/raposapib.pdfIn PDF document text
    • http://dsagco.com/Upload/file/13700569493.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/87780828240.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/23028094842.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/39197812284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=photo+timer+app+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_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 17452 bytes
SHA-256: da845a53f7a4722d8695100c852b1e4811c2019b74a7ef0614134fddacf833f9
font_01_sfnt_off00012360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B77 10444 bytes
SHA-256: 0e092c5e52f4474e9faf3f01aa9b4ad10751dd697a9a881b4122567a2a02aba5

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