Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3e321f30401ec1…

MALICIOUS

PDF

76.6 KB Created: 2021-09-09 04:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6cf0bb4070166e9d7da61159a340bc5 SHA-1: edbe1a6e1fef9c75df444f6cb63a6df425e4b4df SHA-256: ef3e321f30401ec129319e711ac9987c86e0a06b815f21045c85310b0ae333a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URIs. The PDF contains embedded URLs pointing to various domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=marvel+future+revolution+download+apk PDF link annotation
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/sosepovezorifijes.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/kujawixukozopofudo.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/54345324102.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613433b458214---wavax.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/99870268232.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/81496910359.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/davisodisizadug.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/70808836949.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/ruzoguwipepesetodugerale.pdfIn PDF document text
    • http://anpharma.net/upload/files/kogumexiviti.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/42440077966.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/55029681919.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/20504146025.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/nevowaresogaxi.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/25491995969.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/18132594603.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/batewodirid.pdfIn PDF document text
    • https://la-klamm.org/Files/files/68316293880.pdfIn PDF document text
    • http://scro.ru/pic/file/1745944643.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/25061503840.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/bivutulivadoku.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/50798078291.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392d1f57834---wadev.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/zawuxorelorixedifiji.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_off0000c654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC654 10660 bytes
SHA-256: 2e06c5d42d882746169a497854646dd5f4c11f386975776fd538a8bc718748c7
font_01_sfnt_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 17788 bytes
SHA-256: f9a57a4ba42a36601c3639d8da3f9d0a4d3fedd105e4bf314a4c77555188423e
font_02_sfnt_off00010d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1