Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40863db8dc170a6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 01:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56d21ae789766d3b11ac361b55316561 SHA-1: 364b490a33f8a6c59cdce05a5e07814ebca52ad0 SHA-256: a40863db8dc170a6f28e9ae448dd70396ba348bffdc94a7cef7f3aa6b659c5d6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a second-stage payload. The presence of embedded JavaScript (T1059.007) suggests it may be used to exploit vulnerabilities or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d81f3c3d---87535450761.pdf In PDF document text
    • http://lorichphoto.com/pictures/file/85065966525.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/92810825587.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/85361917175.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/46536984201.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-1/20210901072518767064.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/fofalebugufoxaxigisiwe.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/soxedasale.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/woxomebenelakotisi.pdfIn PDF document text
    • http://vititanon.com/user_img/files/finakus.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s7mn0ptcqu8vd34s2murj13u8n/wugujapi.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/27541717045.pdfIn PDF document text
    • https://basisangka.com/contents/files/wagudupitiwagetiwevuko.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/21301521587.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/zeresolilo.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/71650723631.pdfIn PDF document text
    • http://indexone.ru/upload/file/85740079231.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/13168149758.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/dofixat.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/wunekazuwipesezutiti.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/12129120635.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/sijivesinawuponiwazusa.pdfIn PDF document text
    • https://fong-cai.com/upload/files/89274984072.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/nenikabusamabagofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=computer+for+chemists+book+pdfPDF 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_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 18028 bytes
SHA-256: 13561f52266fdc0555835adcc9a9fd8f9e2987bc73f8bda220dfdb48da97377c
font_01_sfnt_off00010787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9E 10936 bytes
SHA-256: 205b67a7f71d50f10f5eb36663eaeba61b622f902007fbf5586aeee7a8da6e5d