Malicious PDF — malware analysis report

Static analysis result for SHA-256 0735bff0d43eecdc…

MALICIOUS

PDF

80.3 KB Created: 2021-04-19 04:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 176c704c5eca2d0478323f6c4bb301ee SHA-1: 17492404a090c4c9b6db3ebbe24fd943cafd1721 SHA-256: 0735bff0d43eecdc4134ca612d3c69014d83b0ad4135bc7de9e7079bef01c9a8
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains multiple embedded URLs, with the primary one being https://kuzutuzo.ru/strik. The document body, though heavily obfuscated, suggests a 'character analysis' lure. The presence of PDF_URI and EMBEDDED_URL heuristics indicates the document's intent to redirect users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=that+evening+sun+character+analysis PDF link annotation
    • https://muxupodijem.weebly.com/uploads/1/3/4/8/134885552/3242979.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/vocabulary_list_for_ielts_writing.pdfIn PDF document text
    • https://fimulumalopa.weebly.com/uploads/1/3/5/3/135326017/jugod.pdfIn PDF document text
    • https://cdn.sqhk.co/pubisifibuj/dWR7zhc/18927963570.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/98046253178.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388157/normal_5ff2c0d0c4b97.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/3979715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_600cded4dd722.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/99jb7jc/ruporunebavuvos.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/jdu2Bmk/smart_launcher_5_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402289/normal_5fdf3611a1bf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422382/normal_5fe9d65710150.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/jbpChc4/sogudevibokukekibam.pdfIn PDF document text
    • https://nupetumagapet.weebly.com/uploads/1/3/1/8/131859993/suwed.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/ifhbwjf/bugojizaxotixoledurot.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/makro_catalogue_september_2020.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
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_e33fd4237437412ca72a024c0a0e7543.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/how_to_use_a_negative_scale_factor_volume.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/kexinedafajijonawewofi.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/lake_diefenbaker_fishing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/teridagutixamipag.pdfIn PDF document text
    • http://pujumek.myartsonline.com/76665996018.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/wrong_turn_7_movie_free_480p.pdfIn PDF document text
    • https://09af0a6c-c0e6-47ff-90c1-5b173435ccd1.filesusr.com/ugd/b92b66_208a1a4accc24a23807099ab70f3a4e3.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 4944 bytes
SHA-256: b9189af2404e452b65ef2aa5bd204cc9f4fe09165a82cddda5d2e8408f68c3e4
font_01_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 11004 bytes
SHA-256: 02063d9681d70b12e030894395174d27e56458fd0d1e07851e748a054ec55224
font_02_sfnt_off0001253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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