Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc1a76fcf1f5143…

MALICIOUS

PDF

67.2 KB Created: 2020-11-21 02:32:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d40550afd305607caca8dc041aa0dd89 SHA-1: dc6dda9391e6a668a30c7a7ad8cac07cb0f897ff SHA-256: afc1a76fcf1f514389b55ac3f8cf819701e651d35922bfb9fae0367eddc0dff5
164 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 presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/123?utm_term=pokemon+x+and+y+rom+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420020/normal_5fb340fc4a8c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_5fa37b3cd164d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422135/normal_5fa0b6abe5763.pdfIn PDF document text
    • https://kixatefibav.weebly.com/uploads/1/3/0/7/130776592/lakadax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5f90ec75a4c55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410988/normal_5fa931ba58166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_5f9c83dc897d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_5f933a3d7a53d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_5fa87080dc2a1.pdfIn PDF document text
    • https://makodute.weebly.com/uploads/1/3/4/6/134649936/nezeguxu_butexeg_kutife.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/tixupowifidubolesuropufuk.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/yasin_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/map_of_johnson_lake_nebraska.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/11558529189.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_off0000c857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC857 5120 bytes
SHA-256: b899600430afcb6061dd4a90ffa037a7896d45674bca077e8615c287186884ef
font_01_sfnt_off0000d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 11128 bytes
SHA-256: f74e8eeca9d5e0441520983ed3fee36b8e1a6ef46415c4ccf5fa987c38d32dce

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