Malicious PDF — malware analysis report

Static analysis result for SHA-256 3426263a8ca359a5…

MALICIOUS

PDF

73.6 KB Created: 2021-09-25 20:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05af33b9570ad479f17bbc1726da7102 SHA-1: 06c1810241ecc6fd47ab841bd560a0cd86fdfd46 SHA-256: 3426263a8ca359a5d4561fd19a2a7c066f76ea4696b589c8954cd8bd0e0a4bd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting it acts as a downloader or redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a large number of links on disposable hosting, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sanmuabancongty.vn/images/content/files/lifodalozejizajide.pdf In PDF document text
    • http://tc-antey.ru/uploads/files/35167068205.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/dowawifaleduzubutu.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210905115721032.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210925_035656_125.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/24933345982.pdfIn PDF document text
    • https://aedwea.com/upload/foto/kokuvapid.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/jinolosinefonul.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/kitenavi.pdfIn PDF document text
    • http://anm-av.de/uploads/files/67875001403.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/zufolukogawex.pdfIn PDF document text
    • http://skncn.com/u/files/sosulokavuronobebefe.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/revegitidolibulexaj.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/3412261314.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/ligeduxoweladivigataf.pdfIn PDF document text
    • http://contextuae.com/resimler/files/xalegifalatebivifavov.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/vizujikidotikegamenudugi.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/gajuq3df5ntnbq0ivop9patnqh/tazerimubidajatevis.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/24928184259.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/kejeseviwokigefev.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/51830241742.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/gerabuvijavupe.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/kemurimafaborugidag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=angamaly+diaries+torrent+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_off0000b3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E9 20080 bytes
SHA-256: eac848cd3e22cd20a17e4ed936c2e9f89209177206ceedb5327cbd0ba8a093f3
font_01_sfnt_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 10772 bytes
SHA-256: 0257448c867d6e04f20e42729fc7fb27a53df952c5fd2db2a4d40ecfc130f2ef
font_02_sfnt_off0000ff24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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