Malicious PDF — malware analysis report

Static analysis result for SHA-256 611f45f1fa9ce11e…

MALICIOUS

PDF

70.6 KB Created: 2021-06-06 09:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e728f1a215842ee910f4ffa174e0290c SHA-1: 938b158d866b6eec0a94b02aca607758563aa004 SHA-256: 611f45f1fa9ce11e68946aa9bab330db9c890e4d3f3a44d9773590ffe9c1909d
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/pbw?utm_term=roblox+studio+apk+android+iphone+windows+phone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386622/normal_601ee62941b6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490929/normal_5ffc966f394b8.pdfIn PDF document text
    • https://vuzozemipasu.weebly.com/uploads/1/3/6/0/136051601/7917876.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422627/normal_5fe3b386b5222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379220/normal_6053ef99acc00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386834/normal_5fd61288b075e.pdfIn PDF document text
    • https://mukaperu.weebly.com/uploads/1/3/4/6/134649449/8322785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467038/normal_6048e6f56b008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376858/normal_6004692e68818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471455/normal_6069540512228.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/380e680b-6d92-4bcb-b945-e32e5aa40a15/keurig_elite_b40_reusable_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86918dd8-71f5-4402-a139-501c224263b4/george_orwell_why_i_write_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2232022-9ddb-414a-a15c-355df7f7b490/lopikakago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3469bced-4d05-46f1-b30f-68ea13fb5d9a/ralegakof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95de7a6a-efed-4c42-8564-ee7a83c697cd/xezoxexutetefazaluwodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22636d0b-c672-4c9e-b924-91c62be26062/zunilexolugaselikofevul.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_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 5416 bytes
SHA-256: 0186266715654a5ebe336da5bb99d6a32db5a0dd0aac0b8eeb7ccf7eb803ab44
font_01_sfnt_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 10364 bytes
SHA-256: be8e18fa6f6de6379bb5fcc3a191246fa839089162b228c5cecade589609d386

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