Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea91867431a4141a…

MALICIOUS

PDF

71.6 KB Created: 2021-01-01 20:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3155da5c5cbcf8434e061244ef31e875 SHA-1: e8e254aafd3107aa9ecdf718eaa4c285a224065a SHA-256: ea91867431a4141a58c5eab94aedb7bdb1872d6a63e2c90d585951408a32d1b8
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://traffnew.ru/123?utm_term=groundskeeper+2+rake+for+sale PDF link annotation
    • https://guserokofetaw.weebly.com/uploads/1/3/4/3/134341966/jixaziget.pdfIn PDF document text
    • https://basisini.weebly.com/uploads/1/3/4/7/134775363/riwugabesu_zutew_nofupezamasok_nalenufobafira.pdfIn PDF document text
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/6265387.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/xopowinubomokon-zozofefodijawuf-bimafajawevagu-pilavebenixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417216/normal_5fb967805f9e7.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/bigunurusipota_vovavubavuw_malolipesafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_5fa23ace7a707.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/6789842.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/redatenopo.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/jedaxopopuko/zonabibonisizonusew.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/93673240461.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/sirititekenil.pdfIn PDF document text
    • https://s3.amazonaws.com/vibove/d_network_drive.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/zetaxujuwowotuvaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7666e11c-f9ab-459f-be26-9ea002a30999/22579127451.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_off0000c9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 5016 bytes
SHA-256: 11080a5a4c8903d6459df9ba2effe50d879e2099ead690dbef10e76d912be3b7
font_01_sfnt_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 11456 bytes
SHA-256: dd3ae314dfdf46f049e5c7165b3271331f17de32c420389e69d0eba31bdadcef
font_02_sfnt_off00010206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10206 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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