Malicious PDF — malware analysis report

Static analysis result for SHA-256 276e1f329e5e49ca…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 12:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f483091385e47c3cb79be328d5a8728 SHA-1: 4548ebbd9758ef0e6ffdad3dca2f22a1f2c7cc37 SHA-256: 276e1f329e5e49ca084d52311595bf14336023f398296b1160687181734937b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the large number of extracted URLs suggest the document is part of a link farm designed to redirect users to potentially malicious sites. No scripts were extracted, but the presence of embedded URLs and the overall structure point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pilot-market.ru/new/files/file/63772138523.pdf In PDF document text
    • http://saktigroup.in/uploads/tabosoleziziwu.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/7015996171.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/96863455027.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/bezawopal.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/65157247311.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/67323387480.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/gakeferor.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/xigamijikepubajem.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/70249841758.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210908_7B5B592F85AE20CD.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/52809397318.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613878e8aed29---limutolawikazivan.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/rirunigamapewadoj.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/lumegajatezaw.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/34836834177.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/39795580365.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/41029371451.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/52612989717.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/xaxokimarukagowi.pdfIn PDF document text
    • http://rc-modeller.se/images/file///70600154753.pdfIn PDF document text
    • http://bronia.org/userfiles/file/somonet.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/45857741882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+do+i+do+a+screenshot+on+my+phonePDF 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_off0000de48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE48 17944 bytes
SHA-256: 4d0939e2d86eba8f08b65db008e2613997eb42b02839f0c1f4e097d78bba8ea0
font_01_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 10924 bytes
SHA-256: a4de7554350e53113ff5e51ec6050a152e5f95f546cdef6a04e7c2e30d080802

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