Malicious PDF — malware analysis report

Static analysis result for SHA-256 d645a5a0a4b1af78…

MALICIOUS

PDF

74.3 KB Created: 2021-05-30 23:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 191aa08c17853f13ecf3800bd6c9f1fb SHA-1: 996a83b2b3ea596983aceb5a056ed93800ccb7b2 SHA-256: d645a5a0a4b1af78902295190e45f3267074f2958c24327116365429921f5ace
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 of which are disguised as software download results, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

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
  • 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://vilenefex.ru/strik?utm_term=kinemaster+pro+apk+no+watermark+2017+free+download+for+pc PDF link annotation
    • https://lukexurilewudon.weebly.com/uploads/1/3/4/3/134335891/36e5e24ef9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464083/normal_604749dfaedc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_600a4f41b0317.pdfIn PDF document text
    • https://voxuvuru.weebly.com/uploads/1/3/5/3/135390020/revudufe_gidiluviki_numumebimoga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_602daa024e2cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426277/normal_60338c98b5386.pdfIn PDF document text
    • https://bivedaniliged.weebly.com/uploads/1/3/4/7/134732971/5727565.pdfIn PDF document text
    • https://bijixaxiferagew.weebly.com/uploads/1/3/0/7/130740480/jisexuvovukutasug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478134/normal_5ffa33bed2eee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471275/normal_601910b05f9d9.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/7689c9fa-b7c8-4d0b-9aa3-5afc0317666f/sitomukaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/684f6099-42a2-49e3-b07f-21bb465be6c9/how_to_change_my_safety_first_thermometer_back_to_fahrenheit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e247eb4-3816-4dcb-96d4-f187b3c8fe21/libro_de_matemticas_2_de_secundaria_contestado_conecta_mas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f875181-dcf9-4906-a857-17bf615f217a/why_is_my_wireless_keyboard_not_responding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/754ace5e-9d67-4d03-aefb-a6548fcb48cc/saa_green_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abca1f23-afaf-44b7-a04c-9a9e0203983e/1829853230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b38360f0-6476-4999-9a75-6d6d5b628a5e/kiwevonojonimexolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096ff511-77f1-47f8-82e2-1b7a6b34d0d6/tobedanawitemitelawalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e576d372-6175-4377-a3b7-83674bd7ac14/sulijumazafokofanebomepi.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_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 5832 bytes
SHA-256: 3fa2c3ae425e3e184f5604a2d1628464a88daab5c49c321b2873459092bf81b9
font_01_sfnt_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 10412 bytes
SHA-256: dd7fb3c73c90358f02154a1f314ff534df58a2d0854a8503a84957668b7c241c

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