Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffc3dc06500c16d…

MALICIOUS

PDF

71.4 KB Created: 2021-02-17 06:36:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5e5c34828f270fc9948e316e774b3e2b SHA-1: b1ae0a7c70e2d11c79473959cfba9ba82476b74c SHA-256: dffc3dc06500c16d7751ab118160ca1d926f98b2f0927e6a448115e5ab356b67
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=traditions+and+encounters+2nd+edition+isbn PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372378/normal_600808e5ba9ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446650/normal_5fccd56d98911.pdfIn PDF document text
    • https://tofeligekejogen.weebly.com/uploads/1/3/4/8/134873344/9ca7ab7f4af4bf.pdfIn PDF document text
    • https://negazebofukiwan.weebly.com/uploads/1/3/5/3/135318678/vobagamon.pdfIn PDF document text
    • https://metogixum.weebly.com/uploads/1/3/0/7/130775033/6736174.pdfIn PDF document text
    • https://kesuvovim.weebly.com/uploads/1/3/5/3/135317554/zaxusujugozig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449421/normal_601208965f31b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426269/normal_5ffa6f321086e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fcefb4b842ca.pdfIn PDF document text
    • https://kovepezerolozu.weebly.com/uploads/1/3/1/4/131483153/vatem.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/507330effa4.pdfIn PDF document text
    • https://guzezetuxavipub.weebly.com/uploads/1/3/4/7/134765233/90e2afca2.pdfIn PDF document text
    • https://sugovodeko.weebly.com/uploads/1/3/2/6/132681033/xadogutekefon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471683/normal_5fc5cf1894941.pdfIn PDF document text
    • https://jaluburevajag.weebly.com/uploads/1/3/0/8/130874017/4288978.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
    • http://wuduzukatej.epizy.com/votuwavubajigusevizikor.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_off0000cdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD0 5004 bytes
SHA-256: 6c8d46c3f081fc7cd4ef24c897e5fc7c966b32d05f140fdc3620f090f84cb1b2
font_01_sfnt_off0000ded6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 10424 bytes
SHA-256: 913502f8ef8fbc008a3d22cbd32207fb82161ac7bac5c0139a9de314300396ed
font_02_sfnt_off00010271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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