Malicious PDF — malware analysis report

Static analysis result for SHA-256 25dd445e7c2f9ae8…

MALICIOUS

PDF

72.8 KB Created: 2021-09-13 22:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 78093430f5079b7a133639e53a923c15 SHA-1: 933f80828d94f4a8a6cac3be27654a1f2472a211 SHA-256: 25dd445e7c2f9ae82927a80b7ffa205e3fd537889fac9a705a0c43961ac1aee3
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of many unknown reputation URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://maraulsan.com/ckfinder/userfiles/files/31229286924.pdf In PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/seturuponajiwojusipusir.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/76975281862.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/duxopakaparojoripozizisot.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/51034011425.pdfIn PDF document text
    • https://phr4u.com/files/guwelukizuluvuzur.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/40151475929.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/misekar.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/43981455980.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/zuxenejadivug.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/43498513785.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/21129665241.pdfIn PDF document text
    • http://parfumland.sk/upl/silupavojavabifoxazok.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/xivunegud.pdfIn PDF document text
    • http://net-marketing.hu/images/files/95883963936.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/18305122509.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/60507094596.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/vigafazupuribob.pdfIn PDF document text
    • https://forumsevens.com/images/file/dezojenudowulonupik.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/zodijajunabubopedi.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/78741234551.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/seperaxufo.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/82778708824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+convert+phone+to+webcamPDF 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_off0000bb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9C 16504 bytes
SHA-256: 291f201e60cfdacc0f25730263ee5180175c12bacc39dc7d21b838e8f185b2bc
font_01_sfnt_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 10616 bytes
SHA-256: 809db0658a8699b209b74a49de9f8acdbe15ce055ecfb20a25a2c94f5093a593

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