Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bd0eb451f27da8…

MALICIOUS

PDF

75.5 KB Created: 2021-02-27 09:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9a7c3bcc000da4fa3833afee81b14306 SHA-1: 92b1c3e03d3382554ba4df0ad57760fd2216eff1 SHA-256: 82bd0eb451f27da8bd02d1636f372914607191ed69d2083928896de1901b961e
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://leonvi.ru/wix?keyword=chapter+11+study+guide+answers+stoichiometry', which is likely used to deliver a malicious payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to study guides.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=chapter+11+study+guide+answers+stoichiometry PDF link annotation
    • http://tifusavegapawuf.mygamesonline.org/simple_marketing_plan_template.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/jiwisigetizoxif/bully_free_apk_ios.pdfIn PDF document text
    • http://zesafemumibow.myartsonline.com/damituzerodekamaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/zuxuvedotozaperoj.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/wasugixakusatosofase.pdfIn PDF document text
    • http://duziroro.myartsonline.com/brother_hl2380dw_wont_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/carrera_crossfire_3_size_guide.pdfIn PDF document text
    • http://filivuso.rf.gd/kigagexi.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/60768204657.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/tajogijipufafujutaboxip.pdfIn PDF document text
    • http://datavofunuta.epizy.com/keeping_faith_series_1_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/68269610162.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/forces_and_motion_reading_comprehension_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/fozutarepudi.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/camarada_arenas.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_off0000eae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 5604 bytes
SHA-256: db0acf8d568cea9f28a7763e8c40f05d20fcbf50a873815ba7ee4fb0830d9eb2
font_01_sfnt_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 10204 bytes
SHA-256: fd0805397ecf517aef02d553242dc1a65439b9662fdbe6e148af39d146b468bc

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