Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcbb484eeac8cd3…

MALICIOUS

PDF

66.3 KB Created: 2020-11-23 18:06:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ebd97bb722188bae0dba587cc0ecb003 SHA-1: 919e32099527d20c347c2a4d6863f678c3c26b38 SHA-256: ddcbb484eeac8cd3abda8b88b80d45971f7b6c1021c78c5c2151b8de36970c6e
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=antidote+to+learned+helplessness PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414487/normal_5fb84a783a772.pdfIn PDF document text
    • https://gadabuji.weebly.com/uploads/1/3/4/7/134715747/sanasuzolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f879d40068dc.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/tipix.pdfIn PDF document text
    • https://rimenedefogifu.weebly.com/uploads/1/3/4/4/134466040/somiragi.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/tadovu/sample_appeal_letter_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cf054bd-1bf9-45a5-a05e-f62964414aee/equipment_lease_to_own_agreement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4053c856-36b2-475a-a27d-7d5ad1a9728e/67202409904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c66123c5-f20c-4857-92d5-8556865454fc/22808002669.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/39655386520.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/kewet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae6d2afb-f3f7-4377-b0b1-eb0d5820a8d9/sikifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/085f83cd-aa1a-46a6-9750-22a9d6afffc1/87533605955.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/xonadowavapetukidap.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_off0000c76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76E 5036 bytes
SHA-256: 373346a0dff1c38ae7a36f50e7f49def91fa12c2f7b151fa3690efd8b2b233f3
font_01_sfnt_off0000d87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 10628 bytes
SHA-256: 7b381d06c17982090a9ef810c9c132260ff0dc8815a3676d7e207272a34ff7dd

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