Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98dde7e314577f6…

MALICIOUS

PDF

73.0 KB Created: 2021-02-21 19:53:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0b51439cadfcba8d2bea06453c30bafd SHA-1: b8f8914d865232f5754252593c60a55c1bd4036a SHA-256: a98dde7e314577f67068ee66b0b3706783d735a1598e4c4a18fdc13b137678ab
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI that mimics a search result for an academic worksheet, likely to trick users into downloading a malicious payload. ClamAV and ML classifiers strongly indicate maliciousness, and multiple URLs are present, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of external URIs and the overall detection profile points to a phishing lure.

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://baarspo.ru/wix?keyword=dimensional+analysis+worksheet+%25232+answer+key+with+work PDF link annotation
    • http://prizinsta365.website/pezonimafrpbq.pdfIn PDF document text
    • http://vizilamu.22web.org/wawukubepilused.pdfIn PDF document text
    • http://juwapes.22web.org/icecream_split_and_merge_software.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/zjteUhe/kiguwolatezi.pdfIn PDF document text
    • http://kelnoteres.xyz/jesixugizoletifugolita5gtj0.pdfIn PDF document text
    • http://o-karte-kopilka.com/theory_of_relativity_and_time_dilation366rb.pdfIn PDF document text
    • http://gozatelaji.22web.org/kmspico_windows_10_activator_2019_free_download.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/vipuxafol/jadawipulewa.pdfIn PDF document text
    • http://pebotavafusu.epizy.com/latikurekobolobofofaneke.pdfIn PDF document text
    • http://guwavamo.rf.gd/taber_s_medical_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/rezamugesom.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/newuvemi.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/83723455963.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/amun_ra_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/80860713337.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_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 5180 bytes
SHA-256: 911709fcabcd072bc9c35167ab5420471a2faa38fdc8e42b523df6af97bf9cda
font_01_sfnt_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 10992 bytes
SHA-256: 7802e01804d7b3ee8f1d5cbe40cc381415874dba784cc2c96396f2e0fdcd083c

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