Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd8de54f2d5a1c3…

MALICIOUS

PDF

79.3 KB Created: 2021-05-28 11:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fc9af72c053b23594c5e115fd8526392 SHA-1: ddfbdfe307f21725ab77e295a076a08fe81b8d79 SHA-256: efd8de54f2d5a1c3cafdb0db39599b5bbb18c294804bcd47843c2948cff88f22
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://nipisod.ru/strik?utm_term=does+the+nespresso+frother+heat+milk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5ff9e8c222bd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409095/normal_601cac93bc1d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484995/normal_606142f1a5064.pdfIn PDF document text
    • https://paparudedolenod.weebly.com/uploads/1/3/4/6/134686514/zaviron-kunupowesutu-bajife.pdfIn PDF document text
    • https://lazarenebuf.weebly.com/uploads/1/3/4/8/134885148/tazebutogal_sofisez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484812/normal_5fc80b592e274.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498366/normal_6009046dc1822.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377414/normal_5fdefa67b6be0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_603708ef13ee7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414176/normal_5fdd37d185708.pdfIn PDF document text
    • https://kakewexetoza.weebly.com/uploads/1/3/4/6/134693891/4307389.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379221/normal_5ff7d4d473f1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463005/normal_5fd0decd942a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_60127d43e8484.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478422/normal_5fcf5132b7ddd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495271/normal_605b33da41bfe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c1b78f90-fbb0-41cb-b92d-ca35def2587b/edenpure_gen_4_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a053e5da-f164-4dc7-8c63-fd4014f1eeb6/84486737651.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 4992 bytes
SHA-256: 025c0d056e4c1059541f6dc0ee0163c0d298434abda7652ef5175d963c5842bd
font_01_sfnt_off0000faea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEA 11208 bytes
SHA-256: 2a452fa8f1c483a6c1bc563f30348b8a14799560e17ed89cc4b254ef569a51a5
font_02_sfnt_off0001212e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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