Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cf57027f43806d…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 06:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b620b370b6b50246ae3aa39722ff492 SHA-1: 01eadab62204c8a3200626577dc2bd61ad182f4f SHA-256: c6cf57027f43806d9571ff9e1e06ac653ac594007b04a1a70225a3c7ad968898
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggesting an attempt to redirect users to harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pet.nfe.go.th/m_site/ckfinder/userfiles/files/debojegerewuzidu.pdf In PDF document text
    • https://langumeistras.lt/i/File/menuzavegigaxibet.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/19768027305.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d26578e27008c2fe9cb518702f9e32dd/39339983768.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/535569665.pdfIn PDF document text
    • https://olterus.info/contents/files/37798687036.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/71257513072.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/gonekapowaviv.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/bununo.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/sikozofebeg.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/46523240488.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/kaxumesigiguzub.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/90840667618.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/vilikuxizemotizadinazu.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/28540888530.pdfIn PDF document text
    • https://seikico.net/img-tym/files/4348854959.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/5929276553.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/tetapo.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/62390797237.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/81416378133.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/momizufigomobuditukekin.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/88595897962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+transfer+contacts+from+nokia+windows+phone+to+androidPDF 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_off0000adba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADBA 15472 bytes
SHA-256: bef40d7379dd240b35071f273498bc9ad7f61963e2e1b702c0c02637015a8327
font_01_sfnt_off0000d51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51F 11008 bytes
SHA-256: 6df9777d5e539984d41a4ca34afdb58f04e5d518d976f6b360b7562e6fed4a34
font_02_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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