Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8eeaf9cef9b79e…

MALICIOUS

PDF

81.3 KB Created: 2021-05-23 22:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c298428e196afc607478b3a899214533 SHA-1: c23f896c7564768fae1a6b10f879e4b0693bc8af SHA-256: 3e8eeaf9cef9b79e0e86778c8b7d6a7035cd52e27d28639db7c8787072472dae
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 0.9996

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://jottigo.ru/strik?utm_term=nacht+der+untoten+world+record PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460465/normal_60182c38e3991.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473049/normal_5fcaa19bdc219.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446924/normal_5fe41fd458daa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383321/normal_5fec7f7f204e9.pdfIn PDF document text
    • https://gurosutu.weebly.com/uploads/1/3/2/3/132303194/6530179.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422659/normal_5ffda851b9ef6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453747/normal_6010938e12de2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_60242a9e2d2e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475215/normal_5fe4b40b65a63.pdfIn PDF document text
    • https://kunoloxudiruk.weebly.com/uploads/1/3/4/7/134767428/3227258.pdfIn PDF document text
    • https://miwevedadig.weebly.com/uploads/1/3/1/4/131437981/lolid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_6057cdb0d9e60.pdfIn PDF document text
    • https://maxanulimaxufu.weebly.com/uploads/1/3/4/5/134585670/2127411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386084/normal_605a8cbbd9c39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452206/normal_6036b9c2d62a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480412/normal_5ff383ed04568.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://s3.amazonaws.com/kizugokofo/jepewezerebiz.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/app_store_for_iphone_5_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/nedoretegetixala.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/bodabupuwijevawawo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 3652 bytes
SHA-256: 85731f318a631e33d84f7a461ff3964871abfc644a96be0c185e698e4cb8866a
font_01_sfnt_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 4744 bytes
SHA-256: df50ae2681d6b3d1f2b793b847001c6785c937289fe3659303ab5d03c4d4b798
font_02_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 11708 bytes
SHA-256: e1771b513b7718f888a6576d6145eaa0e954d4ba30f88b9ddef6f401fe46bb0d
font_03_sfnt_off00012987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12987 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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