Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6380bb9c8e65ed…

MALICIOUS

PDF

72.8 KB Created: 2021-02-20 05:20:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f156de25d4e11c03a7145a392c10845c SHA-1: 02ee0c496e3f6047a1cb718da971dbc225ab4e56 SHA-256: 1d6380bb9c8e65ed5c9e2c3b257678b83be428f9d2576d51f1f17c2672af47bd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to a 'crash course immune system worksheet', suggesting a lure to entice users to click the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baarspo.ru/wix?keyword=crash+course+immune+system+worksheet PDF link annotation
    • http://allwoman.site/galaludenadozefowizaduzon13fmg.pdfIn PDF document text
    • https://cdn.sqhk.co/wovupeni/6iePY5Z/street_racing_anime_series.pdfIn PDF document text
    • http://urologo.store/attacking_network_protocols_james_forshawcrbl2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454171/normal_600ed856db13d.pdfIn PDF document text
    • http://umdtheatre.ru/pelcula_de_titanic_completaro792.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401723/normal_5ff56f69e3af5.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/jgFlifR/miui_5_icon_pack_apk.pdfIn PDF document text
    • http://cmb-eco.com/wagamama_cookbook_feed_your_soul7nu58.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/27c972aae23c5cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403808/normal_5fcd563a4da85.pdfIn PDF document text
    • https://cdn.sqhk.co/todusukiraxi/Sghgggc/16642436594.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/88745054121.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/bhojpuri_movie_hd_sangharsh.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/nom_factores_psicosociales.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/algebra_1_regents_practice_test.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/15320017068.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/opencv_edge_detection_android.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 5172 bytes
SHA-256: 7f310f595777c7731be454d9ef16c7c75d5c81db56acf6e6718c2b6692e6508c
font_01_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 10436 bytes
SHA-256: e6e8214d4c661b52ed9f15b0f5e8551ac9c90e59d6c59a4655fb04e914234fde

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