Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7865f33f88fcdb…

MALICIOUS

PDF

88.3 KB Created: 2021-09-22 14:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e30ff3f3ecc4536209d87ed4253a67ba SHA-1: d0845a2bbe6f4ba2ee67bdd85e0781350c87fc15 SHA-256: cd7865f33f88fcdbc144fa05e7dd761911de863732ce8e76b6afd7f0f81a7257
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the large number of embedded URLs suggest a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://philabc.ru/uplcv?utm_term=mike+tyson+roy+jones+jr+stream PDF link annotation
    • http://skomi.ru/img/files/file/wodizavujasajimusewu.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/ridajuginasu.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210908_225211.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/muwezep.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/tadasite.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/16519050135.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/81917944010.pdfIn PDF document text
    • http://sksound.com/userfiles/file/folawelobezeru.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/lavenotemusijadewosodapa.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210910101853123.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/43903501403.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/21271130836.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147cc90e3759---vidawifani.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/gedapuli.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/68232249841.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/limerezu.pdfIn PDF document text
    • http://midospa.com/upload/files/79695394107.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/pinudovabiwaka.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/dunabaniba.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dfia6u3mipsebvv79osnupjdj7/jobakuvakevenodaxos.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/11009965936.pdfIn PDF document text
    • https://botroul.be/uploads/suvefefomirekigetato.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/jemizoji.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/49899984629.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/pedikixenorad.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/56459643202.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_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 18052 bytes
SHA-256: 022a998ece65025e1361caf380f3dad3af73bd315613ffe1b40645433dedd787
font_02_sfnt_off00013b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B86 10552 bytes
SHA-256: e5117cd1eff20c7a80d53afd2d2ab7621e6cf75c84676f887588c948b00973cc