Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde428e532b9b425…

MALICIOUS

PDF

86.3 KB Created: 2021-10-07 11:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e4093db19acd3f2dd9920f5ec843084 SHA-1: 0d96163e55bd9181a254a52e9a54a371d5fc8993 SHA-256: dde428e532b9b4250ad3ea5a828ae3b28810c5f45973128a21f43a36f1f080e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains a large number of links to potentially disposable domains, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the presence of numerous external URIs points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://chcial.ru/uplcv?utm_term=how+many+ounces+in+a+british+pint+of+beer PDF link annotation
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/2754ebc66a48085af08ba735a9ebd9b3/80262108917.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/33286506949.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/nafagumakexevuj.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/firor.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/tasixuxa.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/guramabemunej.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/14982793307.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/20335229461.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/34170383945.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/93989336085.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/nuvusamakijevevafutozime.pdfIn PDF document text
    • http://abwessex.com/uploads/files/kulafanilajuken.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/30564604905.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/54528572429.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/48409657918.pdfIn PDF document text
    • http://belovosushi.ru/files/dobunatupidibari.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/wamob.pdfIn PDF document text
    • 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_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 20452 bytes
SHA-256: f268f2e1571680724e3f69daa945f26e301c683239851ebda885ef6889ddf6b0
font_01_sfnt_off000119f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F8 11132 bytes
SHA-256: 2ddf90f6fa3b3ec0d83ca6fc88ba7297930c0164bcb71b7801656dca3c7077ec
font_02_sfnt_off0001339a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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