Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d78a1bf5ebd877…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 15:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30496daf81ff5d4edf61333e17864019 SHA-1: fb9b0e96a55fc59ae639f92ee124cf722a46a415 SHA-256: c3d78a1bf5ebd877723f2960347224df1bbe98babf35237c4b8214af0721f6bc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with a high number of external URIs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=mastizaade+full+movie+online+free PDF link annotation
    • http://ky-auto.com/uploadfile/files/57882248521.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/jipukitime.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/zizadoxem.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/36270799601.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/50587672344.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/tebuvupadufutu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613282281dd30---xagoxubewikufamitig.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/worefavode.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210901_125132.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/zamibovuzimunonerugunus.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/77134090174.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091203510978.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/472675570.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/47082495560.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/luvivujo.pdfIn PDF document text
    • http://melvin.cz/data/pimojamigi.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/41885896118.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/polikuwojiwajimigin.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/73198479145.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/vofumilarapotebonemonozi.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/taroxoroxomizelijed.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/jilajot.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134dcca068d9---28871908586.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/kikuwusisiz.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_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 17480 bytes
SHA-256: 2d7677e188efa2a5a84f7cfcda038ff87aeb782db200b298d601201f8a1fe656
font_01_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 10736 bytes
SHA-256: 072ce1281dbcf2f505af7194643b085b1a78cee1bd153c75bc13987171663fd1
font_02_sfnt_off00011eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1