Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb2ef3bac21241a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 18:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 47560dce5eab0454cdb11db1bdb455d0 SHA-1: 7039cdcf95d0545c48cf148541c1571f564f800c SHA-256: bcb2ef3bac21241a734bf8401f582080da8ca3fbe8dcea243eca3e82fe501efe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, including a link farm on disposable hosting, suggests an attempt to redirect users to malicious sites or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd000eaa69---87661711378.pdf In PDF document text
    • http://kemenyseprosiklos.hu/upload/file/kuzokejojexot.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/25686012303.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/23909601812.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/lejegopej.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/39728870856.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/9887193290.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/gumusirosepoxelaxexuvug.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/femuwewajotazixolobujux.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/tuwaxajepepokevusojogape.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/70696638294.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/sezaf.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/29951498711.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/90677714395.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/gosed.pdfIn PDF document text
    • http://brukbet.com/user_images/file/fitebipujimexuxunagi.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/pafugesoxewowitagezirekij.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/39537509872.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/25940205257.pdfIn PDF document text
    • http://artediapharma.com/upload/files/29223297605.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/29468717101.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/89837998697.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/mavozu.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/94133871999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=download+my+fitness+pal+premium+apkPDF 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_off0000c01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 11052 bytes
SHA-256: 20c8b6d0a163e3093abf54bc107609001c5ed3f611d3506ee17b1fda353aa5b8
font_02_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 17268 bytes
SHA-256: 07bb0ad205277c1cc7078330846552e6b5191859e2504e3e7b672e1e91f24fb0