Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7a11c3c3502542…

MALICIOUS

PDF

85.0 KB Created: 2021-09-09 03:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b5cb0dcc259c38e84bbf15cfe031cc1 SHA-1: 15bb65d48a5a94d945c44e62f57d64649ac49df7 SHA-256: ec7a11c3c3502542f64ec80f91fed5d8359a320a15a96407cee81fa725f3b28f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a password-protected archive lure. Multiple external URIs are present, including one pointing to a raw IP address, suggesting an attempt to redirect the user to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://catamma.ru/uplcv?utm_term=script+diamond+ml+no+password PDF link annotation
    • https://endobible.com/userfiles/file/jijuwokew.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/7027955543.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/jitazan.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/jizema.pdfIn PDF document text
    • http://placc.info/up_image/zilovibufusu.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/14282616026.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/85050889113.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/xotiregedosab.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/30706150418.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321e24d4316---wodewo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161307af1a187f---92457887711.pdfIn PDF document text
    • https://robodom.si/files_vsebine/fojovedezosew.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/42287132151.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210904_235144.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/94522800691.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109081936354273.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/mejuxevofasositezitukojup.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/74692571496.pdfIn PDF document text
    • http://geoman.cz/data/file/tugosesozavi.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/90685834093.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210905_014803.pdfPDF link annotation
    • https://vietnaminsight.biz/ckfinder/userfiles/files/64976850901.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/gomamamuwemas.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/nejeregagojelurezax.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_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 18448 bytes
SHA-256: a34043f3f21f7047052e6cb9cc4189763c5e0ffe60117877eb021e13016202ed
font_01_sfnt_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE1 10704 bytes
SHA-256: 06bef3e532654dd6fa06e9d6cd30cd9a296c85dc264315f7691b7b1d2759ae94