Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5aa74bd97506124…

MALICIOUS

PDF

81.8 KB Created: 2021-03-03 00:13:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4fc50e3d7c4c2a78fdd273be6f8b22e8 SHA-1: ada56dec905bd65f01a7a8908b246514ff76c624 SHA-256: b5aa74bd97506124f8fb3cd10bae705fb2c8ee4436cd8b74081a80fc4c4aa67b
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that mimics a search query for 'codingbat answers recursion 1', likely to trick users into clicking it. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the primary attack vector appears to be directing the user to a malicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=codingbat+answers+recursion+1 PDF link annotation
    • http://fodefon.getenjoyment.net/what_is_fire_baptism_in_the_bible.pdfIn PDF document text
    • http://ijmalan.xyz/bob_revolution_flex_2.0_recalli4t9j.pdfIn PDF document text
    • http://tiktoktop.design/quadratic_inequalities_worksheet_answer_key5x9du.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/delonghi_1500-watt_ceramic_tower_electric_space_heater_hfx65v15l.pdfIn PDF document text
    • http://vizazovabula.mywebcommunity.org/1769484236.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/interior_design_software_free_for_pc.pdfIn PDF document text
    • http://olymp-trade.top/juruturojixajenznfys.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/how_to_install_gsm_security_alarm_system.pdfIn PDF document text
    • http://teasmall.space/zeforesiselujadawuvovv9kzt.pdfIn PDF document text
    • http://rollernefritmassage.xyz/gugonefovkzc8d.pdfIn PDF document text
    • http://gaydating.world/movimento_circular_uniforme_e_uniformemente_variadox5v4u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/high_school_printable_book_report_template.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/cellular_and_molecular_immunology_abbas_10th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/5387947044.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/aravalli_range_information_in_marathi.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/bokas.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/soxakobesesefesikofo.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/bifokewuza.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD62 5264 bytes
SHA-256: 9f0d711c6d40f4154ab9aec63ced0f6e73a2f268598f89bdb6710e006f144945
font_01_sfnt_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 16332 bytes
SHA-256: 798b3962f826731b447db6c204c2e20e5dad4eaea7b18f3ea91276e80e321149
font_02_sfnt_off0001220f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220F 16132 bytes
SHA-256: 43e84046d57c5d8edad47de9228ce36feb53c5e515436c294a71041590f3a3a6

Open this report in the interactive analyzer, or submit your own file for analysis.