Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e92e9f7287a9562…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 07:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b956dde7377e22e9b1805699ecf91c93 SHA-1: aa560908ba6cb72efe1f29f9dcb819ddf268f777 SHA-256: 7e92e9f7287a956250f5d7d99efc6841a303dcd9e2c2dcb81e12075a84fbc806
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d14a10b175---vosamamibofusukuwe.pdf In PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/22929775236.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/rokiponagase.pdfIn PDF document text
    • https://ckmandarin.com/uploads/68971989571.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/41023243617.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/zosovebejesut.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/62362855393.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091320361173499.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/kogus.pdfIn PDF document text
    • https://computerzone.pk/file/pagijowabobolepolibupogum.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/7197596724.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/bolajoj.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0fd3ebd8---24834634565.pdfIn PDF document text
    • https://petala.gr/userfiles/file/82420618831.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/82921165052.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/bumadugobuwesupifun.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/77016449467.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/rudepitagolej.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/fudagisenik.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/96468449064.pdfIn PDF document text
    • http://pronobile.com/catalog/file/vobiriwu.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/98124827774.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/13955419326.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/53452112923.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/35674324017.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/7861252861.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/xefirulodufudivumodirakov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=conjuring+2+in+tamil+downloadPDF 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_off0000c09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09A 10756 bytes
SHA-256: 7d679892e40f28c6df10a4c764d963fbc3e269cad005ea51845a3561d3a60a52
font_01_sfnt_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 22692 bytes
SHA-256: 8df28e31afc94572cb82e62d4ca40e6e7a7d4d8587a807d81e12c9acbf1906fe
font_02_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1