Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f9ef1234590a56…

MALICIOUS

PDF

74.3 KB Created: 2021-03-28 02:27:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0e5442d4a9ec204d05108456a1ae02db SHA-1: affc870ab990d6969fce019c95adc0b2961bef9f SHA-256: 23f9ef1234590a561dab9afcb3087baa33e246442a47d2556fca76ada129adc7
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI that leads to a website designed to appear as a search result. This, combined with the ClamAV detection of 'Pdf.Phishing.Trojan', indicates a phishing or malicious content delivery attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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://leonvi.ru/wix?keyword=chapter+6+psychology+test+answers PDF link annotation
    • http://zonitupupafof.sportsontheweb.net/hey_there_delilah_guitar_tab.pdfIn PDF document text
    • http://takinodexitimax.22web.org/miss_peregrine_2nd_movie.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/pazatuv/conclusion_financial_ratio_analysis_report.pdfIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_b4d2a9dd7ee84bd9a8a6ade080d58f86.pdf?index=trueIn PDF document text
    • http://lipajegisuwi.rf.gd/detect_font_family_in.pdfIn PDF document text
    • http://gagaresereveku.epizy.com/zilunutokeduzabotevi.pdfIn PDF document text
    • http://degepedafapuf.epizy.com/airplay_mirroring_pro_apk.pdfIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_8f660e6efaac42769d1af8308fc5e4d3.pdf?index=trueIn PDF document text
    • http://wekolutunumoze.rf.gd/pasar_de_a_word_sin_programas.pdfIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_601f9291a65a4f2bab5461ffc656309c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sigobija/lenazigujoseburupabo.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/phr_study_guide_anne_bogardus.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/android_billentyzr_feloldsa.pdfIn PDF document text
    • http://vovajixavago.epizy.com/19882499493.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/fuded.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_07c03cefd81948b88d6fe50dcc58f852.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/xufejexagikukimejige.pdfIn PDF document text
    • http://dotimazuf.rf.gd/86876925800.pdfIn PDF document text
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_d183eff1f66747fda361d9662246668f.pdf?index=trueIn PDF document text
    • http://tobidogajetu.onlinewebshop.net/boris_cyrulnik_libros_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/vex_iq_clawbot.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/lotogexagefizinepidukij.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/40226812298.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/66954445770.pdfIn PDF document text
    • http://zupotid.epizy.com/51928661589.pdfIn PDF document text
    • http://kopolug.myartsonline.com/44234271388.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_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 5448 bytes
SHA-256: f4aed24e0458eb5a5bd3ef3e6ab95f7ad9ca0cc3f0e087a79e6b6f7108c5cde0
font_01_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 10624 bytes
SHA-256: 0a4c119b0c1b508277d8a986d7de2123f33eff372f605e4149b8c3543749aa97

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