Malicious PDF — malware analysis report

Static analysis result for SHA-256 959d8f29bdc95628…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 06:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7a92b1b35e898c93d334b744d9492f0 SHA-1: 1c9b945115ad8670580cf826cbdf4dd5482d772e SHA-256: 959d8f29bdc95628dc7bfe119ff0b8a2229ee601e6e002f583a456c3cd512436
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 potentially malicious or unknown domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing/malware distribution vector.

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://nordiskvillaventilation.dk/userfiles/file/sanaj.pdf In PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/40659286422.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/56681378052.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/najusidavenekagus.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/57545505125.pdfIn PDF document text
    • https://clickbox.ro/images/file/75974617435.pdfIn PDF document text
    • http://floramarble.com/uploads/82272061830.pdfIn PDF document text
    • http://le383.com/uploads/files/54727802841.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/fojomipoj.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/zosiladizeponoxelofixub.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/14595004226.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/62067524663.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/41475119324.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/4746042928.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/73549583376.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/jifobuzemibipumuvedikil.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/87294879576.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ea318efa3326ed7213764b3dac3bdfde/totinelafapagefebe.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/gojiserilefelis.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/bisejenevawufubezigidimij.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16147df9ef1fa6---56322060352.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/ladirawaxibedegirifineni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=siphayo+2016+watch+onlinePDF 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_off0000de7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 10940 bytes
SHA-256: 22d7cc8c999ff83baa88e7729ff7a00f1f94e7c92e464f8a72dd5d5cc298af0d
font_01_sfnt_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 18348 bytes
SHA-256: 90a05db89d6a586e4da0d8d016c738077a0169c189bdd027391498279e9b7001
font_02_sfnt_off0001271c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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