Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1d4936794e8945…

MALICIOUS

PDF

90.5 KB Created: 2020-11-27 03:33:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f03989e35796451e4cb4a46dc8242eed SHA-1: eaa5b7246ba0dd257fc2b6111db612dc0ef00a06 SHA-256: 1c1d4936794e894502e5f321f6dd59a8f7bd5b17527984205b459b603744dae0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm', suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attack pattern involving directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffnew.ru/strik?utm_term=carlos+rodriguez+castelan PDF link annotation
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/tevurepizenebur.pdfIn PDF document text
    • https://kadikodol.weebly.com/uploads/1/3/4/7/134747526/debafonez.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/kuwekewugi.pdfIn PDF document text
    • https://ridixuzo.weebly.com/uploads/1/3/4/6/134605053/sakog.pdfIn PDF document text
    • https://ruragivelexodi.weebly.com/uploads/1/3/4/6/134663557/watikaji-nidodajiwomum.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/2c15a4bb-aff6-4e1d-8c8b-c81ffe56d188/79180856026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72662b5f-77fc-45fd-aeef-ce41e6a4f01b/salomasirilokuwap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b070f2ec-819b-49a8-adde-a5220ce76053/51035017162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b922907-24c0-4ce5-b3a2-a82945bb7dc1/pure_flix_app_free_download_lg_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07767d6c-5297-4b0e-95b4-9d7678ab7e20/vukevunijomejenugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d10f3cf-25bc-4b5e-b984-befea4ee7466/dofojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/361caa5b-b06e-4938-ad61-2911789f9745/wowutenal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9f67e9-a4ed-4981-b86a-3a6b60566b32/48095987761.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 5060 bytes
SHA-256: 51fafd6548987b62ddb8b64774e7975b65859dc1670ac2770ec4f913a9b68d52
font_01_sfnt_off00012111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12111 12620 bytes
SHA-256: 94e3e14bb288c81e9192e67bc16cd3314c70ae086b2f2a87a67b77d775f82834
font_02_sfnt_off00014800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14800 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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