Malicious PDF — malware analysis report

Static analysis result for SHA-256 903d0dd158cf1769…

MALICIOUS

PDF

73.0 KB Created: 2021-09-15 23:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5cb12363137ded4de7df65ea1a02834a SHA-1: f9bc629ea26afc24d3f9b7c5cb60f0341b3fcefa SHA-256: 903d0dd158cf17698581cf57ea9c01df729401a8940ebeabf7504bff13298ff4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable domains. No scripts were extracted, but the presence of external links is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chmelo.hu/sites/default/files/file/63791418368.pdf In PDF document text
    • http://wohingltd.com/userfiles/ruveveboregeriwukusigoxaw.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/56103665786.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/bijatavuzifenab.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/kafosuvelobojaxopalip.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/sewezidibubasoziz.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/12059183041.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/mewefasumumizavanupeg.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/93276801462.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f859a0e60072b9cbbbd3bbfe87142211/48607556464.pdfIn PDF document text
    • https://apra.pl/files/file/digawababeponufenovigas.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/17442305271.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/nekubiwokatoza.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/xijowobodamuwaz.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/relufipu.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/41626846586.pdfIn PDF document text
    • https://businesslife.com/content/files/96089831374.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/sorin.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/523887bf69dee462d29cbcf6f8b55ceb/juxoruduso.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210910033751.pdfIn PDF document text
    • https://eclearusa.com/images/file/33252335636.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/4564131903.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/sifuzimavezas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=true+life+full+episodes+freePDF 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_off0000bace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACE 10188 bytes
SHA-256: 47c2f38202a4ac9b07062bf24606f41076c4c8d01181e10730938b364868c207
font_01_sfnt_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 17260 bytes
SHA-256: 879f0e217e05428e6220cd46af9bb5a8756f513d91dec7d3abbab4bee719ae51
font_02_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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