Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d039f6b0c5b2c4…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 11:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71c2eb5c7b7788d4bf78436b9b0a7a74 SHA-1: 0d639348de0a1cb03525a3c007627e5c6197bb97 SHA-256: 91d039f6b0c5b2c4b195e12c9ca52920e9d8630cf42b79671afe427576e4e5d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links pointing to various domains, many of which are suspicious or unknown. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

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 https://esprimagroup.com/userfiles/file/nusasutemumelimipa.pdf In PDF document text
    • http://ty-int.com/files/files/lilapon.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/95650286226.pdfIn PDF document text
    • https://adikmanis.com/contents/files/lexagadagumilinewow.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/musabodopagevoge.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/kauseculs557sn2lhjltagj9h7/73743917891.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/ruxorofenesilovow.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/pofaz.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/xowebikik.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/kudepitagenek.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/ruxelerijowazitunowuwux.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/21912653641.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393b0bac44f---ziwowurawalinumu.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/fejojegunokubejowa.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/23798009858.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/50986167611.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210901145127.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/xadage.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/fopanoz.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/seguretilajafabedas.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210909151806.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/5607564829.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/dewibolojodinadamumi.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/bajejuxoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cara+mengganti+ip+androidPDF 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_off0000d037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD037 16380 bytes
SHA-256: 2663ec4a2b817fe96cd6dc29004399e7b79e369a378a203362dfb8ea89c5063e
font_01_sfnt_off0000fa4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 10552 bytes
SHA-256: 88554a09b33a0da9ace60eb94e8593104f11df868300bbf63c8bf390a5e4a24a
font_02_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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