Malicious PDF — malware analysis report

Static analysis result for SHA-256 0751190b80ebb728…

MALICIOUS

PDF

70.2 KB Created: 2021-02-19 22:48:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 33e9be44c19e57189ec79e435a740e8d SHA-1: b4d1f82e398f5956e83924d5b9022fc857109293 SHA-256: 0751190b80ebb7287eae8f290f64a08a1ccf70a8a3704e98fcac5c021ebba4ea
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document body, though heavily obfuscated, contains text suggesting a lure related to hearing aids, and the embedded URI points to a URL that is likely part of a link farm designed to redirect users. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=which+brand+of+hearing+aid+is+best+uk PDF link annotation
    • http://seluluxafej.22web.org/belkin_n300_router_setup_software.pdfIn PDF document text
    • http://kawofeme.iblogger.org/sufawomanexoso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dolufin.epizy.com/90640855790.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/big_data_tutorial_point.pdfIn PDF document text
    • http://rewoponoxeki.rf.gd/86059782.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/50807216843.pdfIn PDF document text
    • http://limizepafut.epizy.com/first_vs_second_conditional_worksheets.pdfIn PDF document text
    • http://mesujexu.rf.gd/anemia_falciforme_dominante_ou_recessivo.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/11092783579.pdfIn PDF document text
    • http://vuremekewema.rf.gd/gupelegomasetinifatoleju.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/adobe_creative_suite_5_trial.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/nazosifigolu.pdfIn PDF document text
    • http://velupar.epizy.com/noun_determiners_worksheets_for_grade_4.pdfIn PDF document text
    • http://mevidow.epizy.com/94373279628.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_off0000d59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59A 5468 bytes
SHA-256: 4851b63a0aa66a4a5c98bd943b7b892408a0b2bea01bef792f1379b26a794fe9
font_01_sfnt_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 10412 bytes
SHA-256: a2ba961dcacb4ba1f258abbf4f16c114f110f2b2a9b72c03c5c4cf78328749df

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