Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d46d1bc330c360…

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 07:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a30ef315d08d8e274655f2f9c021e53a SHA-1: 23cbd248be1e7f34e732914da26cb1b44bc17d93 SHA-256: e8d46d1bc330c360091e25ecf0a7d64ba1e03c06e10c2c059bfece621574f4be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/bozumukodibafepu.pdf In PDF document text
    • http://evo-models.com/uploads/userfiles/files/fubeguga.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47424096956.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/f11410ebb7b0f597726126f1bd2b09d6/8212087915.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/bopilinopogaxaz.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/jimatovosufetafage.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/87732191664.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///7609927659.pdfIn PDF document text
    • https://laser123.com/geektic/files/fatosupigazebudunasarom.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/zumuwanovi.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/75287711826.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/zutix.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/pinelizadatopedow.pdfIn PDF document text
    • https://profesa.net/userFilesfile/mezavepavubijikabed.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/15732536856.pdfIn PDF document text
    • http://standdominica.org/files/files/julukalozat.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/zedotekanodoraj.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/xadidivavaxalufomi.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161329e4ca0f26---fawumew.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/miwupepob.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/zepix.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/xarawamalivemijagugokesag.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/jugomesivulimakunilit.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/89886624608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=block+messages+on+android+phonePDF link annotation
    • https://lapdonline.org/file/nitisutelamaxerovaruza.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_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 17756 bytes
SHA-256: af80ffc127811f76215c23c1c72bb170baa1a46f3c3118ed54a844d87ffc1af4
font_02_sfnt_off0001380b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380B 11008 bytes
SHA-256: 40e48d37874a3bb24c356b8972d3e6f8d6be922b2f61c84f044e98ceedd0c0dd