Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8666ccd020554ef…

MALICIOUS

PDF

86.9 KB Created: 2021-06-08 00:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ed4f031073668c9e9e83d1a0c7f139d1 SHA-1: 407806a3023d0dd3e8e26c797430d7883f15f9e9 SHA-256: f8666ccd020554efa9534c268e94911e0dcf0f90db0bb9333e9b81104cbe753b
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a PDF link farm, and a specific URL pointing to a resource that appears to be a lure for downloading a PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and external links suggest an attempt to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/pbw?utm_term=piazzolla+libertango+piano+four+hands+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445333/normal_603b033e31c47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461773/normal_5fcd0b86c193c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388283/normal_5ff9c5f35612a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_5fce313f23bfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450907/normal_6056c51986f06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473947/normal_5fc903170bd4b.pdfIn PDF document text
    • https://semufukat.weebly.com/uploads/1/3/1/8/131857602/fofuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387589/normal_5fd03c86e9d53.pdfIn PDF document text
    • https://nojijakifon.weebly.com/uploads/1/3/4/0/134012839/b4f6187.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4462368/normal_60b7627dd3b4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450257/normal_605544a5ca0f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/17e70e2a-1220-4aea-afea-7510a062e1f0/negimipivineda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/503d7569-4b04-47c5-a8e3-a67f7717b1bb/62841551090.pdfIn PDF document text
    • http://guvevef.pbworks.com/f/limites_y_continuidad_de_funciones_de_varias_variables_ejercicios_resueltos.pdfIn PDF document text
    • http://sokulus.pbworks.com/w/file/fetch/144464931/how_to_service_a_husqvarna_riding_lawn_mower.pdfIn PDF document text
    • http://bowawesup.pbworks.com/w/file/fetch/144538254/if_conditionals_type_1_and_2_exercises.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/tisamuvivolomoda.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 4592 bytes
SHA-256: 52162215f2a28b8ace125fd12bd51083a25fbeb9fbe8da9068c5247e7e918577
font_01_sfnt_off0000ffbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBF 5376 bytes
SHA-256: e8114ee8d382db613e4856d4f0b9b12e4ebbc2189ed441ce49af3f27b46cc47f
font_02_sfnt_off000111fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 15072 bytes
SHA-256: b7a46a29db067927f70315407308411a66f065c9701241a3a410f5cb9232ef44
font_03_sfnt_off00013fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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