Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1096e3cb4cec368…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 16:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d29e1444a834d904b8e046dd8e44ae0c SHA-1: 861138094250f863c1d145404b3c3b70f09b3c4c SHA-256: d1096e3cb4cec36831579e00f8baffe7803e23d08f1040bafa3d080741a981cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it contains numerous links to disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

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://www.hon-ro.hu/userfiles/files/tosarijodesavigudolumi.pdf In PDF document text
    • http://www.siposferenc.hu/html/40532946818.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/belumotuxaloforaxuzenipa.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/nobamugelivijamuranu.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/26058771962.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/36745801602.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/bikasewuzit.pdfIn PDF document text
    • http://builderall.info/userfiles/file/61074201381.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/manijetawabofatin.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/rerijofikupiwuwasiw.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/jifixafukizukinaw.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/0fae647b7a1a0e1b2615c88a8795dd4e/47372974633.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/444920204.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/24626063001.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/poxolilejixudopop.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/wowefafudoje.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/bedibadabedasajeku.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/felumubarowume.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/tugibijanil.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/kerewoditufeteka.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332d91518d9---78254880121.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/xijagakusow.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/67599897078.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/ruzunuwelopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=similar+apps+to+mobdroPDF 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_off0000e140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 10532 bytes
SHA-256: 51e29ec12eff4fd1be257c8f90ef6087d6af1e563750330e71484675296a6184
font_02_sfnt_off00011100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 17428 bytes
SHA-256: 6ce7cf1a2234890fc2c1ffbde10ed626149cfb99773e0e29f79e5384c88e1312