Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8694b93f72395f…

MALICIOUS

PDF

72.1 KB Created: 2021-02-22 20:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 916c40d51d12ff276631f8ef157b1d19 SHA-1: 6e1121d90420a7955b98bf34f553ba12673a92a9 SHA-256: bb8694b93f72395f95fc4f7f573c39a46020defe2f4c4827c70340a74c5bdf2c
96 Risk Score

Malware Insights

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

The file is a PDF document that contains a lure for 'homework cheats' and embeds a URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of an external URI suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=xyz+homework+cheats PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370555/normal_5fff6f4667128.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/5381525.pdfIn PDF document text
    • https://cdn.sqhk.co/lixejudazeza/jchaGjf/kobe_vs_lebron_james.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409093/normal_6001a4f02054e.pdfIn PDF document text
    • https://vefavufarexuba.weebly.com/uploads/1/3/4/3/134315694/ziwebovakere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464056/normal_601e018ed8ede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_5fd1fe13d167e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_6013c9bac9c94.pdfIn PDF document text
    • https://cdn.sqhk.co/lenufetimop/X7Z5jbr/woworozizo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421629/normal_5fe03be39831a.pdfIn PDF document text
    • https://xorigikaku.weebly.com/uploads/1/3/1/1/131164164/508020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420476/normal_6003ae9f81f9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_60201886dac60.pdfIn PDF document text
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/15b305.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/vezumobigodub/critical_and_exploitable_vulnerabilities_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/dajukemobejar.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/video_alif_ba_ta_tsa.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/33046829025.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_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 5292 bytes
SHA-256: 02ac0c5666e801801f7f17f722f63ec9066183119251398170d5670457fe4bf0
font_01_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 10512 bytes
SHA-256: b521723b2ff6fc1a22e216f82c4def19606d8b7f1ea9df63612bce46212567d4

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