Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e1d1f3c8d9cb3b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 10:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d067125cb1c024b66aa18d582842d3a1 SHA-1: c208bf7ee8895badc8b0eb7d61c658565dbd4524 SHA-256: 18e1d1f3c8d9cb3bda33d95afa161c251dcb1d02f8f76aaa613bac90cc40cd0d
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 of which point to suspicious domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a potential lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://henskeschildersbedrijf.nl/upload/89039077655.pdf In PDF document text
    • http://goldsunjsc.com/upload/files/fesunotanavudetulipeze.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/59875375363.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/38028766464.pdfIn PDF document text
    • http://gioithieu.btccorp.vn/uploads/files/manozisipikelotadumejiwon.pdfIn PDF document text
    • https://toocapen.com/files/62236857685.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/fijoxejuvin.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/boxezinaxasonuza.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/44822963382.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/95115504407.pdfIn PDF document text
    • https://bselink.com/userfiles/file/96484794620.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/sexokusijela.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75584576660.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/91648514580.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfb0773a24---pixegemeten.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/terewonabawoviputuxixat.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/kevifokemuworila.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/90568727626.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/96584636117.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/vezozonopitinalup.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/fomuwutigabajagigutom.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/meniz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=windows+print+to+pdf+driver+downloadPDF 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_off0000c47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47F 10636 bytes
SHA-256: aaec023906b3092eaeeb4812d2d9fafdb222344d3bbf5ba07f31bf1ba1173a86
font_01_sfnt_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 18492 bytes
SHA-256: 5ea7c0808aa3f120af8efde505e23bc837c3bc7e015909caa975b8c63dc90497
font_02_sfnt_off00010b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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