Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ec81fbb6d78673…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 01:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b7b9a9dc2d2af42c866ede39a3c88500 SHA-1: 706d162233869bd915166294fdb75ba129cd2179 SHA-256: 05ec81fbb6d786738733901908aba0dae4e370aad6a41022ea1d792ae4733be2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it is designed to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://foodvellythailand.com/upload/files/muzeri.pdf In PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/bazik.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613895c080024---sixulufofuwelurefat.pdfIn PDF document text
    • http://dhf-china.com/d/files/lijuredudagobadogizobu.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/46223177444.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/70117441260.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/minaxodorimuzojizuxur.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/tunenegafimom.pdfIn PDF document text
    • https://fivetc.net/uploads/files/pezigotiloxo.pdfIn PDF document text
    • http://aprt1day.ru/file/8808298561.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/zepitijobotebizo.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/42894768145.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/wipejusatexukitobebuwogar.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/kisagutet.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/64544481518.pdfIn PDF document text
    • http://portableandcool.com/files/files/70245246831.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/0jvvpb5dpq8sbr5ecm7t71l1a3/xovatidipo.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/mumavaw.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/4005024842.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/33030141181.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/30786886518.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/fimogesiwibunanujo.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/5498890960.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/42854570254.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/ramuletegajinulewatili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=meilleur+lecteur+musique+android+gratuitPDF 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_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 18064 bytes
SHA-256: ba79949966cd11b5ac37f18d9d3a18e922bbb85da8edab2ff3dd2a5a4909f0f8
font_02_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 10952 bytes
SHA-256: 4e49424991fa1f5fd72fe229ad21a0114c7b9f478925df9c46d1a85f667f4766