Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a0e45093d41e11…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 09:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f44e89f783fd8b268fc25761a85b1ed2 SHA-1: a7c69e4d644f84dea4202236c63e4fa3df59537e SHA-256: c1a0e45093d41e11a578cfb8dc1a2721f126a43678933785cc56cc627f691450
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and appear to be part of a link farm. The primary purpose seems to be directing users to a network of sites that host more PDF files, potentially for SEO poisoning or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/uplcv?utm_term=panchatantra+stories+in+english+book+free+download+pdf PDF link annotation
    • http://meetburgerusa.com/uploads/files/48885722588.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/werazapusofexiz.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/tapenik.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/nodavilonoxugunuwujevi.pdfIn PDF document text
    • https://network-italia.it/file/67829301940.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/xusuterumuj.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/lutogaja.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/29883659301.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/jepudotitemololona.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109042009324502.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/85210252973.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/vawupisazukixikibo.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/gozolagor.pdfIn PDF document text
    • https://aromamarketing.md/img/files/xaletegezu.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/bowigapidumelu.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/xisekoxupupofodiwewuruj.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/virajasorilutu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/0a12fd0225e430da3a177e29cc882ac2/joribikitaxa.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/mavegazolode.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/bozapiwivinapinirujobafiz.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/15921861593.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/16025478082.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/1642278147.pdfIn PDF document text
    • 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_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 11216 bytes
SHA-256: c823210136887b4e109b8b2fd3041d11f32f1ff54d1f55ca0fb6a779e6e6faff
font_01_sfnt_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 18908 bytes
SHA-256: aeb9eaf74625b734d1e73c1ab4a57b6d7f4a716d3e044cd0eb6ea36cffef2816

Open this report in the interactive analyzer, or submit your own file for analysis.