Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf6178955faeaa1…

MALICIOUS

PDF

76.0 KB Created: 2021-03-20 01:05:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8af5a96b3fd53d3cb5f9884d5de05a3 SHA-1: bad1fe906c83043478d1ad6acd2f3089e473d133 SHA-256: ebf6178955faeaa1e2f567e23c23b5aff7cdefad88bd5f0c2b6ba4e2672b8d52
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML classifier and ClamAV also flagged this file as malicious. The primary malicious URL identified is https://resalured.ru/strik?utm_term=fan+tastic+vent+parts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=fan+tastic+vent+parts
    • https://xupatoxavivuni.weebly.com/uploads/1/3/4/6/134615471/gibopulemawel.pdf
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/dubabuxedof-nideseji.pdf
    • https://static.s123-cdn-static.com/uploads/4476601/normal_5febc3eeb1f28.pdf
    • https://kekulepolunan.weebly.com/uploads/1/3/4/8/134889268/af5d3.pdf
    • https://cdn-cms.f-static.net/uploads/4448100/normal_6027531cce902.pdf
    • https://mefufexuwi.weebly.com/uploads/1/3/4/0/134019004/relatabopokuz_kijixesexew_xokefet_niwosilejupu.pdf
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/tosimokufek_satipurevi.pdf
    • https://fogasofimoxor.weebly.com/uploads/1/3/1/0/131071298/sizozupol.pdf
    • https://cdn-cms.f-static.net/uploads/4379987/normal_60126e022f417.pdf
    • https://cdn-cms.f-static.net/uploads/4426424/normal_601edad8d8a45.pdf
    • https://sepuvoguzunisam.weebly.com/uploads/1/3/4/4/134488558/salubikowurovizemu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xugigabitulu/what_anime_characters_birthday_is_in_november_28.pdf
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_5f9b011d624e4d52bf22c198eb3fb5f4.pdf?index=true
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_4b11a1a8378040d196e86c54b62c1047.pdf?index=true
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_bd0a1fec665a4d33ba4e71c5d95bbe71.pdf?index=true
    • https://s3.amazonaws.com/ganubatebedoxez/1693994458.pdf
    • https://s3.amazonaws.com/wixanarer/demalu.pdf
    • https://s3.amazonaws.com/galinikagopit/best_drug_guide_app_for_nurses.pdf
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_e346f772bb4b463c97735f70529642dd.pdf?index=true
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_2aed206690b74d8092d97ccb35526be2.pdf?index=true
    • https://s3.amazonaws.com/fizufapu/how_to_use_elgato_hd60s.pdf
    • https://s3.amazonaws.com/juvetaso/wekenovedumepipex.pdf
    • https://s3.amazonaws.com/muxozuvalubi/moto_g6_manual_tracfone.pdf
    • https://s3.amazonaws.com/lebejos/tattoo_keloid_formation.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec10.bin
3ebb60d9c4085fcda480ed9a7a5264a4e0e883ec76435b6b0f38c088582aa015		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 4912 bytes
font_01_sfnt_off0000fce1.bin
2f0b8d437a6cd1c0160269418c590c2945e0ad0d85580cdc9d64a8b2b0230ab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE1 10624 bytes

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