Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ee2ebe689810e8…

MALICIOUS

PDF

75.1 KB Created: 2021-01-21 07:21:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 56ec578091b9f1be6cc691490769dc3c SHA-1: 71fc8efc40475072ccfe9a8a5ab2d3d5e7c85cc3 SHA-256: e7ee2ebe689810e8e7760f2582f30dd5cb03c77e0434fab0fd11e16775938ef2
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=1920s+slang+worksheet+answers', disguised as '1920s slang worksheet answers'. ClamAV also detected it as Pdf.Phishing.Trojan. The presence of embedded URLs and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/123?utm_term=1920s+slang+worksheet+answers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4470689/normal_5fec28b9e63b6.pdfIn PDF document text
    • http://dovulup.iblogger.org/23254508602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413575/normal_5ff1098d530a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_5f909347b9451.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/dowesitobuga/election_commission_of_india_certificate.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/legukofanegedenujisixava.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/academic_cv_latex_template_economics.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/petty_cash_imprest_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/design_sponge_city_guide_portland.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/mamufujerasuzeluwalonamin.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/71501810150.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/spannable_string_bold_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/zodabaluseb.pdfIn PDF document text
    • http://pebimomedunuzux.epizy.com/xuvudokogevobutove.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_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 5488 bytes
SHA-256: 278551ec88eea1be1951d102fa07ab553875684a9b37c4e7facb2b3bf26cbd0e
font_01_sfnt_off0000fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 10976 bytes
SHA-256: 0e19ac8a23778ed64ef3c763a5f26fe53ca1f312358ac4e6aa7b00d6a9a9d403

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