Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec8c55dd2e743b9…

MALICIOUS

PDF

76.6 KB Created: 2021-09-21 06:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bc9e61755949a28a7100d85137bd026 SHA-1: 9e5b989a345167b2e429c41afc5b524fb79190e3 SHA-256: dec8c55dd2e743b938b62bb9f9f3c2c9dd9a298b5d39e800b15e355b88ce52a3
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to download further payloads or redirect users to malicious sites. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards an attempt to exploit users via client-side execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://nomylo.ru/uplcv?utm_term=gemas+clash+of+clans PDF link annotation
    • http://advocaatindex.nl/images/uploads/kebutagatunovopijenirile.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134058ece48d---gojofifajiguwaz.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/jusemigun.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/82241632576.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/bejajepizomupub.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/sejazixogarajevopezujat.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/62052387077.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/77719395469.pdfIn macro / runtime command snippet
    • http://cyuanmei.com/userfiles/file/8470442689.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/44325007026.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/parenizok.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/nuzasifuxuvulariduxebebu.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/fajinutotenuvekalowa.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/xegid.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/95289700565.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/21884124607.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/93614762865.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/4894184134.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/kifixanopizabapof.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/bavixovinuxigup.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/71294464066.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_off0000c57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57A 18588 bytes
SHA-256: a0e5ee1cfc3106757455226f989c63cccfa4477aba2b87a2a0ecfe3504361146
font_01_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E39 10348 bytes
SHA-256: ddfae599e8bbd7e7d41883a97eb22e7fafd6a8c486a5d40b16293d4653f8aba9

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