Malicious PDF — malware analysis report

Static analysis result for SHA-256 e907bb29ed31aa85…

MALICIOUS

PDF

77.8 KB Created: 2021-09-10 14:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38a028f02972e097ce6d05b4a45dfaa8 SHA-1: 1f64b6bff900f3a4025a558bfeccd915ca1b0471 SHA-256: e907bb29ed31aa85e34203060d7b83410df78d0c3a8f4067572144dc505be2b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. ClamAV detection and ML classification confirm its malicious nature. The document body is heavily obfuscated and unreadable, but the presence of many links suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65933753532.pdf In PDF document text
    • https://satellietgroep.nl/userfiles/files/87618649272.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/femawulakafo.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210910/file/1631240287.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/xolowa.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/70919359018.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/dekunifanafuvajixekogiril.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/woboburutijenupe.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/19470041970.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/tatesitojuvirageduriza.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/55510473716.pdfIn PDF document text
    • https://ivanamihic.com/files/22465352741.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/wulavelinabupud.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/musedajimabimumorovuruk.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/99546204120.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/rupexodofiv.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d69026855---gupovabunik.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/wikukovu.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/10370076036.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/45409348643.pdfIn PDF document text
    • https://alohasafaris.com/files/jojatelupokiramunozudenad.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/28507999778.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/purovamovewor.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///fabipuwuboda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=riverdale+season+5+movies123PDF 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_off0000ca5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 10900 bytes
SHA-256: 5cbac5d0a01e046db79e55c23d440ee03b677cf6e6e1e9b9c794183869eeeebe
font_02_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 17952 bytes
SHA-256: 45a929d20cb50a591622043ac60e905b727357b6464b7f819c531f691ed5fe5c