Malicious PDF — malware analysis report

Static analysis result for SHA-256 03780cd389cc9e79…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 10:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 025a1731db0468e84ac42b3888efb544 SHA-1: 8b308b730e06d374b10defc48d395a0b1807898f SHA-256: 03780cd389cc9e79f8b1de65c6dba4398dd7baa65dd465aa6784611db3798a7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable hosting, and the presence of `utm_term` parameters suggests a phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=which+is+the+largest+continent+area+wise PDF link annotation
    • http://assytekservizi.com/userfiles/files/17027452786.pdfIn PDF document text
    • https://buka.ru/sadm_files/sevebebowuxelu.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/bijurefixa.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210921112648.pdfIn PDF document text
    • http://ippon.lv/uploads/File/tixawumilegumixo.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/pipixawaw.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/xokibobubexewugazut.pdfIn PDF document text
    • http://aweibel.com/Photo/file/loxepoperidi.pdfIn PDF document text
    • https://miminku3.com/contents/files/futizo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613de87259eec---tabanipifimazuxibogi.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/gududewavirib.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/fuxifuvifazewivawoj.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/fuwabe.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/jarixetanafujukenavedodov.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/gegasemeduxigadofamopu.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/rumemuli.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/kupatufuxodemaxuxelujepoj.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/besigono.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/jufekuvuwizenefejapasoze.pdfIn PDF document text
    • http://topstec.com/d/files/59342727635.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/liwesixokarazoje.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091122111174195.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/14065627827.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/80856682261.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613776d5f3882---45314621842.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_off0000b312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB24 15024 bytes
SHA-256: 2401acd5024b69149f87d043676d8994b136ca1e35a44a6a7d21142c2d1608a6
font_02_sfnt_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 10588 bytes
SHA-256: 35cf05754437076321529261772309cd6e1a0de78a3a87262f6a774ae5ed9953