Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d338a1c9518a78…

MALICIOUS

PDF

72.8 KB Created: 2021-02-15 07:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d6253190ff63871455b61ebe7e0e5b4b SHA-1: d196c1cb0b06bb0d4f6bb961518b0e661bf552fc SHA-256: 29d338a1c9518a786bf6b26f9dda34402dc75d300192299f32ef76aa931a3153
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, one of which, 'https://druttle.ru/aws?utm_term=lowest+term+fraction+worksheet', is explicitly identified as an external URI. The document body, though heavily obfuscated, suggests a lure related to educational content ('lowest term fraction worksheet'), which is a common tactic for phishing or malware delivery via spearphishing attachments.

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://druttle.ru/aws?utm_term=lowest+term+fraction+worksheet PDF link annotation
    • http://bluetea.space/vefevijozabusefelepqzq5s.pdfIn PDF document text
    • http://birjand.design/gajisodogalakife7mxxh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387715/normal_5ff06ce4158ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481059/normal_5fff3ff60e79f.pdfIn PDF document text
    • http://vidclips.design/can_t_audible_books_to_itunespqcxp.pdfIn PDF document text
    • http://hisgohar.site/20871980757dxur0.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/anarkali_old_film_songsmjol4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390642/normal_5fe5803e96446.pdfIn PDF document text
    • http://dragonflysagewellness.com/penetration_testing_with_kali_linuxpmd0o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495251/normal_5ff36f288af17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497079/normal_6009de25ef482.pdfIn PDF document text
    • http://kkkirrreeee.space/finabiraxwofi8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_6015816241b19.pdfIn PDF document text
    • http://baffer-shop.space/56151308213b7dc3.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/selivuvumepaveb/ipced_training_course_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/tukezoxaz.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_off0000c73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73F 5184 bytes
SHA-256: 97004e07405d74d294bed87c1625d429384912dced572dd869939bfa363ef46d
font_01_sfnt_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 10688 bytes
SHA-256: 2d475f38f48bad739db056bf1e2bb2f64899004c43a8084332230b1923f6085b
font_02_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 17412 bytes
SHA-256: 6a51de8a47183fb5789c234f6b5aba7c3eb8efbafef1aeffda70da22f5a972d4

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