Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38b0093dee4cc0c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 15:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8302f34b112febea03f63ac36d56def1 SHA-1: 7c704de2eab6b17c587435a3cc092f353b064424 SHA-256: a38b0093dee4cc0c9da06e74cc077630b4bb99e11faf47cd941386147473c0d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high number of external URIs pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing second-stage malware. The embedded JavaScript is likely responsible for initiating the download or redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=app+iptv+apk PDF link annotation
    • https://sanidom.pl/img/file/mepazul.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/jiwobilibalexad.pdfIn PDF document text
    • http://sql110.com/pic/65199357215.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/64920454606.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/37481183594.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146e3a5929ec---74075853763.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/saxedabojavixumotapoj.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/zatiduxazu.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/43163646940.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/82179061965.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/dodaketovugobu.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/4552045284.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/xezuzebexetupitowilu.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/lokinukakanejinep.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614c93d30200f---xivulivozaxoxuvoz.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/75276891607.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/54234871944.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tusabesaka.pdfIn PDF document text
    • https://electroagro.es/pub/files/zadovudusuvulujefam.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/zogozavugawebomadu.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/lufaputofi.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/bikowemameraseta.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_off0000b1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B8 18700 bytes
SHA-256: 07e990e6af8c8f20022ade0f23a1a1fc1385cbd71f750854d739f333d287de98
font_01_sfnt_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 9712 bytes
SHA-256: 86a1b29e852aa6727d91979f30bdc7960c7c58a2d37b7620087e4925f1127092

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