Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec31bec409893f9…

MALICIOUS

PDF

74.7 KB Created: 2021-03-22 16:11:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59372d05cf17ced6c036c96b4471c177 SHA-1: 9ccab0ff0cdb8bbf9d515cca1a0a94072c1b99ef SHA-256: 9ec31bec409893f9ef7926e385f17a8ca3892e19a773d71c58e97441157ef5f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are part of an SEO link farm designed to promote search engine ranking for terms like 'pdf annotator free download'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=pdf+annotator+free+download+full+version
    • http://wellwork.site/kumozuk3rddr.pdf
    • http://world-wildshop.com/dulawadka2w.pdf
    • http://nufurimuler.iblogger.org/13297252424.pdf
    • http://kedusigodozop.22web.org/quantum_hall_effect_in_graphene.pdf
    • http://1-bog.ru/bebebupabeperufedigingorau.pdf
    • http://vemasujananexu.22web.org/fobasilusowukisakipafepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bomupi/arial_pro_black_italic_font_free.pdf
    • https://uploads.strikinglycdn.com/files/d2b9a692-0ca2-4958-8833-682d8155afdc/19876196351.pdf
    • https://s3.amazonaws.com/tanapilamaxi/xupinijofow.pdf
    • https://s3.amazonaws.com/lixisariwulo/manual_de_funciones_y_procedimientos_administrativos.pdf
    • http://nazonuretowu.epizy.com/padani.pdf
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_ee3835840ef647fe98f5a444181c999c.pdf?index=true
    • https://s3.amazonaws.com/nefomojuwet/allergy_bed_sheets.pdf
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_8a2134125b2e4fc08c25bc2dee22962f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c07ffba4-2967-47be-9640-293dfe19c86f/kung_fu_panda_legends_of_awesomeness_episodes_season_1.pdf
    • https://s3.amazonaws.com/mipizaju/fikuludagu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e5.bin
31620963d9ffda16922fd8c3bb405e2dfbbb9423fb713a9b547544400f8c57e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E5 5056 bytes
font_01_sfnt_off0000f840.bin
7d088026e254ea244667cd6613ae61674dea4b761510b90fc227a39faab159d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 11020 bytes