Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8055f2b558f4af…

MALICIOUS

PDF

67.0 KB Created: 2021-04-28 02:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 233849ad9a648fed974e2f7da488ae11 SHA-1: 298b4517a9114d966876cbcbfdd86e3d14bff2cd SHA-256: fe8055f2b558f4af5132348b69372de89bfb4555a7e621d7b1d32abe876b7903
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ML classifiers and ClamAV. It contains multiple embedded URLs, with the primary suspicious URL being https://pelibifir.ru/strik. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of external URIs strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the embedding of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=crochet+stitches+diagram+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452385/normal_601ad1f4da040.pdfIn PDF document text
    • http://setofexperience.site/tukivululavomivirejejomlkp4s.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/mugubaburevikfn0qb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476420/normal_604188c29182d.pdfIn PDF document text
    • http://bella24.xyz/zivewoxemotewoufx07.pdfIn PDF document text
    • http://tihefers.online/vaxijanibogo300ht.pdfIn PDF document text
    • http://lunesygets.xyz/kixidovigagfj8s.pdfIn PDF document text
    • http://ita-bio.space/botisamuxo23e1z.pdfIn PDF document text
    • http://disclosures.space/723809746795ga7n.pdfIn PDF document text
    • http://trackengine.host/dark_souls_3_wiki_hornet_ringp1jac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_606219c1efa42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489839/normal_603fad8be13ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://datidalumoz.rf.gd/appreciation_certificate.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/les_miserables_hit_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/19197653910.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/80972300488.pdfIn PDF document text
    • http://mikusadetov.rf.gd/government_spending_worksheet_p._2_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/59281289883.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/tupolebaludaka.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/mevakevuwewekawojefeguvif.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/leatherworking_guide_classic_wow.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_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 5308 bytes
SHA-256: f023cc4b386a33a830d62979b8454ed840de1763c7a1a4dec2d9844cfa04d025
font_01_sfnt_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 9800 bytes
SHA-256: fd1c3d94d92db58c1eab4bf931f655fe4b715918c6de5369fb04d24e90399797

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