Malicious PDF — malware analysis report

Static analysis result for SHA-256 df58df2679d765e0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 20:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c6b3d4a7e96107808c292303240f8aa7 SHA-1: afb918bc93b62a775f2cc2a8b3353828d0bd1789 SHA-256: df58df2679d765e02ebf4bba9feacec1b6cfbc30feb185dc60abece3e02927b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/72590c6a91251a3133825b0bee0a7804/87698466842.pdf In PDF document text
    • https://morethancars.eu/uploads/edytor/file/xizopitevof.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/wilopofeleguxuwal.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/78128375212.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/gadewunukedelitawesizufoz.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/35875539394.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/21958271476.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/borijowame.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/30453379054.pdfIn PDF document text
    • http://villkasz.hu/editor_up/12205456482.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/19826345772.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/11284223175.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/64153604715.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021090706523916.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/r90735rsmpjtsb4rmcgkq4srf1/20153785277.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/midupowerobaz.pdfIn PDF document text
    • http://telecycling.info/files/file/xasitekevaveramobajuleji.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/biwodufedaloves.pdfIn PDF document text
    • https://siroyensao.com/upload/files/lavetufijiritol.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/fopubepozezin.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/19660926495.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/golifap.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210918171713.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/xifegelidofutarafufefo.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/xinevas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+rufus+windows+7+64+bitPDF 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_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 16488 bytes
SHA-256: 630e9288f9b04ba6a9cbdc820a1cfd5cde6719ab86e3210e5ae1245dc017509e
font_02_sfnt_off000121b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B6 10836 bytes
SHA-256: fe340618440926fd02d5d6319e5f3bae4f82f452461d8fce53d9ffe923b305d9