Malicious PDF — malware analysis report

Static analysis result for SHA-256 671e2bc7ce3252df…

MALICIOUS

PDF

74.0 KB Created: 2020-11-17 00:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 04314deafc47d734205ef1862bcaf79c SHA-1: d8cf8b8ab6baf730cd399b97a4162c20c6ba4433 SHA-256: 671e2bc7ce3252df2298356050f2baa803311c6f42493e427b9cf659a6cf97a1
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://traffine.ru/strik?utm_term=c+programlama+dili+indir PDF link annotation
    • https://jomimufigaz.weebly.com/uploads/1/3/4/3/134319247/rarenetepava_pafox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_5f970b28b536b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_5f97916fa3904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_5f9631d850967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378381/normal_5f9f211ef2f87.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/sowewazulejewi/95652095601.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/99888511384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f563426-b24e-48b1-96d0-29ee187c77da/pinoy_free_movies_online_tambayan_ofw_2010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/828cb4af-d8f4-46f5-943d-f567d3db8724/gerilutixetajoguxim.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/leadership_bs_jeffrey_pfeffer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0e4f020-222c-41e5-b903-d7aee1528fb1/teoria_del_simio_acuatico.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/15826317970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e952348-fcc4-4090-969d-a1add1c2034f/gefatesegorafisilitij.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/tuzejelelerefuxumiteroruw.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_off0000df69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 5008 bytes
SHA-256: 0699b7667a73e852a21a36d221b7ed219001ee94f44abf8388e1eb7ccc99d66c
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 13208 bytes
SHA-256: 34aeca112b9078dc4e9a41f74f38d66631565ef61c68549a1c1bf38cde798dc6

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