Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29e1f49319d21ba…

MALICIOUS

PDF

86.7 KB Created: 2021-02-25 07:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 537e09fab19005c13ee89e4ba9e9276a SHA-1: 0c534e7f91623e72d96a08f233875d2d8cfa413f SHA-256: d29e1f49319d21ba2a167f9abc897e7c613aa14e52f07a7b5fd8e691df69e682
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://baarspo.ru/123?utm_term=free+crochet+patterns+for+mens+slouchy+hats PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368748/normal_5fc604eed2dd4.pdfIn PDF document text
    • https://sopifowa.weebly.com/uploads/1/3/2/6/132681690/6349618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460266/normal_6025dfe0f3d2d.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/LihibLE/ultra_slow_motion_video_software_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421477/normal_6035acf80d8de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465145/normal_5ffde648a923c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460688/normal_5fee3e02214de.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/7gezPij/world_survival_craft_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472208/normal_5fcd3fb9a028b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5fdf90f9a616e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384307/normal_6015d2d460727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449187/normal_5fd903c945e54.pdfIn PDF document text
    • https://mojijunu.weebly.com/uploads/1/3/1/0/131070220/roxogurixalozubeguk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368250/normal_5fedfdcd91ce9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383308/normal_5fdf3ccd14587.pdfIn PDF document text
    • https://mupoveno.weebly.com/uploads/1/3/4/3/134371030/1979763.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://komewubot.epizy.com/25923325940.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_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 5312 bytes
SHA-256: e2d6a2d688ab1b60431fada50445a8bd1047e99b8473531e7fff2d31a427234e
font_01_sfnt_off000128d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D3 10644 bytes
SHA-256: 6f6125ef0a15ff4d867f6804163f50f32dc7f9dded7704b88181e83446d94e1d

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