Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40f4d434a779af2…

MALICIOUS

PDF

75.0 KB Created: 2021-02-25 21:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7c4e8c3fdcb9b6d2b1ded8ac5316ff6a SHA-1: 214adcb1a1e2e00cdf256880239441c1b03c9656 SHA-256: a40f4d434a779af2ddd414a7bb5bfaf646f4dc3cb5931667e33528504f462e42
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily corrupted, contains keywords related to a forklift brake replacement, suggesting a lure to entice users to click the malicious link.

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://seumenha.ru/123?utm_term=clark+c500+forklift+brake+replacement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392862/normal_602f7f1d768d2.pdfIn PDF document text
    • http://itawomen.fun/81801770023fxo8b.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/can_microsoft_office_be_used_on_ipad.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/robakokuxas.pdfIn PDF document text
    • http://vandify.com/ramanofubawakogul7iatv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421360/normal_5ff1d846b9800.pdfIn PDF document text
    • http://winwites.space/50697098494a7c68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420756/normal_5fc838837b7c6.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/zabevog/1790259716.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/nigenutilizi.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/free_annual_credit_report_by_mail_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/9583619838.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/esperanza_rising_summary_chapter_10.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/antivirus_android_app_review.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_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 5360 bytes
SHA-256: eba4a0edb4b6a8d2ab7f8a97645d5aa468b70a4896c033cf017bb48659e30959
font_01_sfnt_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 9720 bytes
SHA-256: fb087cd7f0adaf123882cc2a26ffce403f9cfe3bdb8ee47a21884c2b0890157d