Malicious PDF — malware analysis report

Static analysis result for SHA-256 894dabfcf5fcd72a…

MALICIOUS

PDF

77.0 KB Created: 2020-11-11 05:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fe7a489a312e33bb1528df29e1014b6e SHA-1: 7c62d1c045b05ca17a4b47133df730ceeba34416 SHA-256: 894dabfcf5fcd72a2ffde4436e74a3390976481bdc965ba87dee52583779076f
214 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 routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?keyword=ffx+shinryu+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383156/normal_5f9c63eec2bbc.pdfIn PDF document text
    • https://lajojadarexod.weebly.com/uploads/1/3/4/5/134506383/79b960.pdfIn PDF document text
    • https://xigunokitipir.weebly.com/uploads/1/3/4/6/134615451/zetisigopujiwo-rewunilawu-nelivibeva-mubamabumutavef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5fa1544475d89.pdfIn PDF document text
    • https://kodupupagunoj.weebly.com/uploads/1/3/4/3/134314474/8970663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_5f9443171ea8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_5fa81924e3def.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/fe027306-bf61-4918-bb4f-9821b5990f7f/viwozim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e87c350c-878e-435a-86b4-4676d133ed78/zujaf.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/12973167960.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/ac_unity_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/teacup_yorkies_for_sale_in_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8156bd2b-1a99-4817-953e-95cd0467f0a7/rubrica_para_evaluar_cuadro_comparat.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA4 3072 bytes
SHA-256: d807a62bf9a6aec930b3d0361bf4a1fcbb93f23ef4a1cab0ef0c235a287ab469
font_01_sfnt_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 5052 bytes
SHA-256: 915d162d8c43a962617db5d8df2cfb244bdad7b9dd354ea534b20ac4e473bfa9
font_02_sfnt_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 11584 bytes
SHA-256: b99024396e35636e9503fadd80223b2b5c728bcd4ed29a606a83a813d96e68da
font_03_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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