Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69a572404cced8d…

MALICIOUS

PDF

71.6 KB Created: 2021-09-09 20:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 460fd2714dd949b03496c9b324a2ae20 SHA-1: fa051d584f5eaf4ca6cc4825336b86596a6c709c SHA-256: a69a572404cced8d3def7f58683c1508f683b82bb2a447108e1816d45719ff51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to distinct, potentially disposable hosts, suggesting a tactic to obscure malicious destinations or distribute malware. While no scripts were directly extracted, the presence of embedded URLs and the link farm heuristic strongly suggest an intent to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://aguito.madteam.net/ckfinder/userfiles/files/88213747815.pdf In PDF document text
    • https://toocapen.com/files/35342240358.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/72013737801.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/wotodupu.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/31731224509.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/barifegul.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/kaboninuzisuwinu.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/kogowewuzuboduzadunu.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/52974694728.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/77112276917.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/xokad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314945e77a7---babek.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161368910bc9e4---fufar.pdfIn PDF document text
    • https://arendic.cl/files/53717209056.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/xaridomifoxe.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/rawidesepuwaxewusava.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/kunolupoxabipuluxobul.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/loxilorojuxofituzusurogu.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/78510367385.pdfIn PDF document text
    • http://acelybio.com/upload/files/45204614414.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/76033567928.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/97881026214.pdfIn PDF document text
    • http://teraval.cz/res/file/31297429031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=my+strange+hero+full+movie+english+subPDF 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_off0000b4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E8 16468 bytes
SHA-256: cb846ddca708f1bf12993ef414bc2b0509153c2e34365631df40a4be8eb88db7
font_01_sfnt_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 11076 bytes
SHA-256: 822a83da4edc6aa9baf99194154d9a4d25b7978ee862541ab060a9379d246446