Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f98b9499410a84a…

MALICIOUS

PDF

73.5 KB Created: 2021-02-24 05:38:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ef99be513af5e28b91f93482573d4bdc SHA-1: cf27b1a821b23dd9bf6b2511f6338b9c955f9cf9 SHA-256: 3f98b9499410a84a3762312281cc8f37c68d9d2c3f7f8d7bd8a09eb29756ef97
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to exploit users by redirecting them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wix?keyword=brandon+kroeger+net+worth PDF link annotation
    • http://gabutetidik.22web.org/brighthouse_life_insurance_change_of_ownership_form.pdfIn PDF document text
    • http://faninugure.22web.org/toyota_camry_hybrid_2019_se.pdfIn PDF document text
    • https://tisawotaw.weebly.com/uploads/1/3/5/9/135993845/2f76593e25.pdfIn PDF document text
    • https://bajumavo.weebly.com/uploads/1/3/4/4/134486103/wovelemagokaduded.pdfIn PDF document text
    • https://livugazenexaru.weebly.com/uploads/1/3/1/6/131607095/4857500.pdfIn PDF document text
    • http://zinifezabi.iblogger.org/36640431593.pdfIn PDF document text
    • https://cdn.sqhk.co/volumusigu/dlgh6hb/gevizased.pdfIn PDF document text
    • http://swast-group.website/googly_kannada_movie_audio_songtfo81.pdfIn PDF document text
    • https://vimasideb.weebly.com/uploads/1/3/3/9/133997972/6843448.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/icFoqjg/hongkongcupid_hong_kong_dating_app_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zofigofaka.epizy.com/samsung_brightness_driver.pdfIn PDF document text
    • http://fiviwuzovalexop.rf.gd/sadakapemawetevafogixuso.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/limakibadexezu.pdfIn PDF document text
    • http://watijosanowo.epizy.com/name_handwriting_practice_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/57680307256.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/cathedral_school_uniform_cardiff.pdfIn PDF document text
    • http://mibofive.epizy.com/ace_personal_training_book.pdfIn PDF document text
    • http://konevimojo.epizy.com/cause_and_effect_worksheets_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/65942297017.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/vanguard_zero_jp_apk.pdfIn PDF document text
    • http://segalemu.epizy.com/59495795237.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_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 5080 bytes
SHA-256: 400b010ad4f1744befce4448241b832e914dde52c38a5913fc24f28a204c6d87
font_01_sfnt_off0000f504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 10616 bytes
SHA-256: eb6581bcb1b3fb779a3b135893bbf11ccd427ab630e984f20216f223e5f509ec

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