Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b2c2350fcea80f…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 00:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0b9f7d4632faf54eeff6c9f30b98328c SHA-1: aec6b56e9d3d639a29f22a056fda107420c40a00 SHA-256: c9b2c2350fcea80f717eeb0c0a0d1fae46e3d9d1fab16712709e0d2c9d5a99c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious sites, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krassimirtaskov.com/userfiles/files/47204987108.pdf In PDF document text
    • http://consade.com/userfiles/file/86495348137.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/mufal.pdfIn PDF document text
    • http://garderoba.sk/images/_file/pamunemuvozojarapajuxo.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/52636321.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/pirirutuze.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/34912050561.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/lanadolawuretadegagu.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/belameko.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/wusexuxoxakitonamoragapu.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0966810001632307753.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/sufimakar.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b02775b1f580bccf14f81721d7b89068/tapabavozafu.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109251800428582.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ovinupipuwov.pdfIn PDF document text
    • https://phunhai.net/upload/files/53806470964.pdfIn PDF document text
    • http://novafish.it/userfiles/files/244583487.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/34251726358.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/dinesuxipopuwalerujev.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/junikixoxes.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/mumubito.pdfIn PDF document text
    • https://jck.ro/userfiles/file/binamibak.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/kalux.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/vugazepizuloneruxet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=vn+video+appPDF 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_off0000b285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB285 15588 bytes
SHA-256: 8f8b31a859281a2679f320d78cbc33f36ee0796290ca921a11087ad10a21bde0
font_01_sfnt_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 10008 bytes
SHA-256: 5490f0de1901a1526153201c39b05bf274056bc1eb8c37a21a3b88ca13e229f5