Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a88a518fb4742ed…

MALICIOUS

PDF

107.0 KB Created: 2021-05-15 08:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6a47a91202540f1bdd782ef7086eb63c SHA-1: 9a30312b7a29822c6e1a873dc5a877a75b8b7fa0 SHA-256: 9a88a518fb4742ed8618546f7a8d15553d7beec8207bb37e36f412686b1a0024
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 4

  • 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://mezovuduw.ru/strik?utm_term=projective+geometry+applications PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392853/normal_6037503dc2d0e.pdfIn PDF document text
    • http://checkmycredit.info/what_if_netflix_series_trailer474gt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459937/normal_6003a4b447dcf.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/foscam_f18918w_ip_camera_tool.pdfIn PDF document text
    • http://sobuvide.mygamesonline.org/febukomoposamore.pdfIn PDF document text
    • http://vwwv-avito.online/920590865105k5hd.pdfIn PDF document text
    • http://devicesprotectionforusers.site/gugurobedadoe2csc.pdfIn PDF document text
    • http://kejurudoji.medianewsonline.com/husky_air_scout_compressor_troubleshooting.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393521/normal_5fe5facd3e7cb.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/altruismo_definicion.pdfIn PDF document text
    • http://streamsweets.com/jofevosipbi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447669/normal_60619b419d617.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nisebot.epizy.com/7754977685.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/como_fazer_forca_para_parto_normal.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/88044611202.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/bumejukorunagagikuni.pdfIn PDF document text
    • http://dexixikix.epizy.com/89842044969.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/young_thug_power_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/mugarubuzuloposowigam.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/rusewesatowajupigow.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/combine_like_terms_to_simplify_the_expression_1.17__0.07_a____3.92_a.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA0 2912 bytes
SHA-256: d0763fbd271711262b0a26362cc9c99fb155632731fabfacbbfc72efdb3f7c44
font_01_sfnt_off00013503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13503 5280 bytes
SHA-256: 9571b720f4c27cb2770f2dc9826d76af679ab54f4737aac5117075a252acc42f
font_02_sfnt_off000146e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E8 14872 bytes
SHA-256: 303e93921af739f5878f005d5cfa169589c088af18dcedfc6a03c7ae0848a8ab
font_03_sfnt_off000178e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178E9 16548 bytes
SHA-256: 1c1c7fcd61449c9acd98ffe648d6d9240a3f5360ec70f8f445c9786d2d821d9b
font_04_sfnt_off00018fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FA2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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