Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab340f5aeb871e7…

MALICIOUS

PDF

76.2 KB Created: 2021-02-03 20:48:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 04497b12e249e07da62c9f20360118df SHA-1: 72655a76f43c953724153f811549f8983e4cb2a3 SHA-256: 3ab340f5aeb871e7546373699378f578a9e188468a6682083021d571c8e3a499
96 Risk Score

Malware Insights

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

The PDF file contains a lure related to fixing a 'screen overlay detected' issue on a Note 5, directing the user to a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=how+to+fix+screen+overlay+detected+note+5 PDF link annotation
    • http://reduslimitalia.site/final_fantasy_dimensions_fusion_abilities84io3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368219/normal_5fe3aad7cdb48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502567/normal_5fdfd47fb4b63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386836/normal_600d8d7837858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470533/normal_6014b5a57a996.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413374/normal_5fefb4b5013a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_600a878e24ceb.pdfIn PDF document text
    • http://leftoutclub.com/buzejanetaset9xh9q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369179/normal_5ff8c6562c834.pdfIn PDF document text
    • http://aires.fun/solapur_university_result_oct_2020_download5oak0.pdfIn PDF document text
    • http://vostokzapad.su/birdy_the_mighty_decode_the_ciphercykk3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460055/normal_6002dec8b821f.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/sesijesule/sites_like_fmovies_to.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/82442728373.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/avast_secure_browser_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/85976399899.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/rpsc_ldc_answer_key_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/vimagidejavebij.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/adjudicative_guidelines_dod.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/closed_syllable_exceptions_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/10077027812.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/958790547.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/zoxogosimolariv.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/certyfikat_kompetencji_zawodowych_ksika.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_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 5424 bytes
SHA-256: dc88d702e99164176f88279a41de1309435f6e6b408e8b88cc38db89b457970b
font_01_sfnt_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 10528 bytes
SHA-256: 6d528605830ca413fc4d8a23cf65a8326329c9114985adfd9e284837f776ec2d

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