Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ca5be55e3b98d1…

MALICIOUS

PDF

86.7 KB Created: 2020-11-18 19:23:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a006794d7da7a22147f7de33e55c039b SHA-1: a255334da33fa1b348131bd5fecc3d330fcce594 SHA-256: f7ca5be55e3b98d19be9c043520088c97a7d269282698b76102ac6b95d12ddb1
214 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. It also exhibits PDF_SEO_LINK_FARM behavior, containing numerous links to external PDFs, likely for SEO manipulation or to host further malicious content. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/wb?keyword=indian%20tamil%20audio%20songs%20free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4471710/normal_5fb4f3b6ef983.pdfIn PDF document text
    • https://juxipidupe.weebly.com/uploads/1/3/4/6/134694928/debejamezelowo.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/251edb27656b61.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/roguronamalajefasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_5faf5035f1d7b.pdfIn PDF document text
    • https://nixofukotozawe.weebly.com/uploads/1/3/4/3/134313466/bujugebikosap-nusupafutomi-mizowolugin-rajitikodeje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb590df-382b-4fb5-8777-df2e79448c20/40655878300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c0b45b0-1533-476b-916b-405b2cbcba6b/walexabowiwuvupew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29e95e17-fd27-4238-97cf-0a941007f2ca/dezubugusoleruse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82265650-3fc1-4d32-8a79-a04df3769c8a/36712094992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/880a3ea0-f5c3-4e45-b732-c098a8852589/beyond_diet_isabel_de_los_rios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5f9755-4d61-45d5-b360-b3497a9606b7/zakilofakanobol.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_off0001179c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179C 5164 bytes
SHA-256: 26680b8ca287700ac4b4fa4ec76f14006ec1d38fa23011118c7752d230c657fb
font_01_sfnt_off00012917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12917 11064 bytes
SHA-256: 0a5e00a85c3e8ec0fbf61ad662bbee58df7d9f9af824b7912e80fedad80ba4f3

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