Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a119c343b267c3…

MALICIOUS

PDF

71.1 KB Created: 2021-05-21 01:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b856ea9959d1da850f62648e8d3f6952 SHA-1: 9cdb8645d9df34366bd1ecd505be8addc38e6ff7 SHA-256: 25a119c343b267c32e5f837e917fe912c54d1b33e7b17909a737ab115040353f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent external URI points to 'jumiwimov.ru', suggesting a phishing or malware distribution attempt. The file's metadata indicates it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content, which in this case appears to be a lure. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=turgut+uyar+g%25C3%25B6%25C4%259Fe+bakma+dura%25C4%259F%25C4%25B1+kitab%25C4%25B1+i%25C3%25A7indekiler PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455387/normal_600649946c703.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487409/normal_6002794b95f52.pdfIn PDF document text
    • https://ragixadimeruwu.weebly.com/uploads/1/3/4/8/134897014/5316935.pdfIn PDF document text
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/7df775be.pdfIn PDF document text
    • https://bozemabaseduwem.weebly.com/uploads/1/3/4/8/134880117/6262458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447433/normal_601724815a9c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_5fd2460a42e46.pdfIn PDF document text
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/fakafuputoti-gixikavelekamip-zixadetobirur-fewumewo.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/b67fc37f-a808-4aa7-b766-4c3aa5631c4e/jumpsuit_wedding_dress_kleinfeld.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/tv_movie_guide_ireland.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/inkscape_trace_bitmap_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/describe_the_process_of_atoll_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/20790164778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f051e0-cfe1-4e37-ba17-a54437f2712a/gofudoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db2cf956-26d5-4916-8c3b-bac450a52c09/fegoduz.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/waverixawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed707b9-6afa-4b0d-be82-c37e4d298b1f/reloj_casio_aw-80d-1avdf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe6f306-5e43-44db-b059-05b268fdf870/fasapilupuwinogevudoran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ba1fe9-16b0-4a3c-8a5a-e39d3863ffac/what_are_the_4_types_of_romantic_relationships.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/rujikemimadaluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e830e3ee-1f7c-4061-b68c-7ed918725a1d/last_of_the_mohicans_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/tukupasumuxuwel.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/navien_reviews_npe-240a.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_off0000d3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 5804 bytes
SHA-256: 83ae2bae9a6409ea6f36c664c60cef45be0cdd8869960f5cadc15a2e0874b806
font_01_sfnt_off0000e701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 12180 bytes
SHA-256: c6461dbe985b09160a8b979f10e5b4d7d711b936710d9caba34148d5e6a03e41

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