Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ecff3d4a9a0012…

MALICIOUS

PDF

78.7 KB Created: 2021-05-29 06:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e33b0f59e65cfbeb6f597458fecae7bc SHA-1: 667bb6b71bdbef4d161b62c26f19c3e2a7b744f1 SHA-256: 84ecff3d4a9a0012158764be7ad3f50ba16e8b07e1226b78302d8deab2b2b623
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly hosted PDFs, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, facilitating the redirection to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=free+wedding+invitation+card+templates+for+word
    • https://totimukax.weebly.com/uploads/1/3/0/7/130739837/kelij.pdf
    • https://gedozunirep.weebly.com/uploads/1/3/1/0/131070722/jikojogoge_natasapo.pdf
    • https://magijomolalol.weebly.com/uploads/1/3/1/4/131437319/6562072.pdf
    • https://cdn-cms.f-static.net/uploads/4485702/normal_601a03a0acae3.pdf
    • https://cdn-cms.f-static.net/uploads/4423188/normal_6063c530a97ed.pdf
    • https://guwosifewutus.weebly.com/uploads/1/3/4/6/134616196/812632.pdf
    • https://detalejutapebis.weebly.com/uploads/1/3/4/6/134610814/jewudinovewinepu.pdf
    • https://static.s123-cdn-static.com/uploads/4379049/normal_5fe0133d73158.pdf
    • https://static.s123-cdn-static.com/uploads/4410415/normal_60023d52bf223.pdf
    • https://cdn-cms.f-static.net/uploads/4481520/normal_6015d2e42e889.pdf
    • https://cdn-cms.f-static.net/uploads/4497370/normal_6022299b7e041.pdf
    • https://static.s123-cdn-static.com/uploads/4409420/normal_5fe428b01f94e.pdf
    • https://mogomanazeveka.weebly.com/uploads/1/3/0/9/130969503/8680a41.pdf
    • https://jafowunasakubiv.weebly.com/uploads/1/3/1/4/131437393/1564323.pdf
    • https://cdn-cms.f-static.net/uploads/4405899/normal_606a30cda3942.pdf
    • https://cdn-cms.f-static.net/uploads/4380078/normal_6048c38b05489.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ad4b13e4-f736-4999-a640-b0dc7f315692/pros_and_cons_of_mixed_economy_system.pdf
    • https://uploads.strikinglycdn.com/files/95d221eb-887a-432d-b007-e5c526c8db88/32998494481.pdf
    • https://uploads.strikinglycdn.com/files/981fd3e1-6da8-473a-b5a0-f466043c50e7/essential_clinical_anatomy_by_keith_moore.pdf
    • https://uploads.strikinglycdn.com/files/d6345d19-9490-4188-bb78-6b5e4154c5d5/wikobidazugesas.pdf
    • https://uploads.strikinglycdn.com/files/9e3bd8c2-9b2f-48b6-bd6b-6d8799495c13/jazowuvuwowibaxubodid.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_off0000f55b.bin
7b44641ec5ddc2d7a0bdb4bc10ab8b9b2ac2a16b22398c9b1f04fa6cfc83a22f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 5584 bytes
font_01_sfnt_off00010863.bin
cf16d456cfaa2633767516115ed38a7d318cee56ec5de95cbed46986efb32873		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10863 10824 bytes

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