Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb99397337b60f11…

MALICIOUS

PDF

72.7 KB Created: 2021-02-24 04:23:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 99fa84e84085a8a408c7008d2de05534 SHA-1: 9bfcfe70e424238d45b588bdfc31dc2ed0838be5 SHA-256: cb99397337b60f11d1b1eb8bcf5150551af17e8c3909a7f19d34695029bd214b
216 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://vixezijimike.weebly.com/uploads/1/3/5/9/135993975/80c3b61e98.pdf.
  • 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/wix?keyword=chrome+driver+download+85 PDF link annotation
    • https://vixezijimike.weebly.com/uploads/1/3/5/9/135993975/80c3b61e98.pdfIn PDF document text
    • http://kuzunutonaw.22web.org/right_triangle_trigonometry_formulas.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/xopugup/possessive_apostrophe_singular_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/bottle_filling_plant.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/atoms_worksheet_question_sheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/87069064415.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/hssc_clerk_admit_card_haryana_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/what_is_the_main_idea_of_all_summer_in_a_day.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/aha_latest_hypertension_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/rununuxapopidal.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/94483035764.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/whatsapp_status_sad_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/javascript_async_defer_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/blendtec_total_classic_original_blender_review.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/77271730753.pdfIn PDF document text
    • http://paritoxo.rf.gd/softest_breathable_bed_sheets.pdfIn PDF document text
    • http://fijexuwafofe.epizy.com/88741210442.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/briscola_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/12462699028.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_off0000e07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07C 5260 bytes
SHA-256: d26069c1a2535fe937682ee26fb08415e40c18bb71910a9e51c76909a11874cd
font_01_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 10380 bytes
SHA-256: 46413a0b94eda0b67ea9cf857aea8d1e49718c3685f851506fe94b126f94cdd2

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