Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1f9cf814272528…

MALICIOUS

PDF

75.5 KB Created: 2021-05-31 08:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8e02c62ee337e120185c2d72211c0640 SHA-1: 4248f31cf14d17ff1f99517838b8169b66808c92 SHA-256: ef1f9cf814272528f27b0b177f4e2d12aab3ec2709f039fa300d5d2c2cc45660
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a suspicious domain that appears to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=printable+christmas+colouring+pages+for+toddlers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420760/normal_606d32be5c741.pdfIn PDF document text
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/tonenemax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371240/normal_600173606802f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492275/normal_603d418486954.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386087/normal_5ff02af70febe.pdfIn PDF document text
    • https://degobevotu.weebly.com/uploads/1/3/4/3/134393677/329651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460972/normal_5fd1ff00da92c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5fd9a17f5afc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495393/normal_605d224aca88e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5ff26fa2c56cc.pdfIn PDF document text
    • https://vepakuwaderim.weebly.com/uploads/1/3/4/6/134699920/vedirujixukewon-tubejabed-fusogijabu-watejijoxaro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_604ca2623325e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_6028930557f51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_5fe63be76b703.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369491/normal_5fe2afb05aef5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365575/normal_600841e571df5.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/5bdba399-18ed-4279-96c0-1656fba373e1/citizen_eco_drive_divers_watch_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86ce5cc-c782-4323-84ee-de52e457cc82/87969970615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7510bd28-5438-48d8-a8d0-eb52ed6e207a/summary_of_chapter_13_le_petit_prince.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d1ad34-9f8f-4ebe-aeff-5e259e431a30/is_ghost_of_tsushima_on_xbox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c80c5d-00b3-48de-b9e1-15e28e6d47af/vijusexijezinuwikugewuk.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_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 5712 bytes
SHA-256: 3c5b60ab1b6f8c8e882e196fa474e85d267466ca3683bcd838e5e86932bd0ae8
font_01_sfnt_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 10436 bytes
SHA-256: 5cc959c26eb789481c93a1022f886b80915bf4b38140ac282ecfe0da18f57de7

Open this report in the interactive analyzer, or submit your own file for analysis.