Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3c41c42b674157…

MALICIOUS

PDF

68.5 KB Created: 2020-11-17 07:49:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a804b7c24f933e8dd540744889d31f68 SHA-1: d25546b69fed1f16c630027fa03b4560c4d5719a SHA-256: 2d3c41c42b674157a81823d2892ecb59e0323573a8d8e11db1e1568af415a874
186 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/123?utm_term=read+eragon+online+free PDF link annotation
    • https://wuserugojikenek.weebly.com/uploads/1/3/4/5/134513610/fuzuvedizu.pdfIn PDF document text
    • https://rozujefugupag.weebly.com/uploads/1/3/4/0/134017035/naxunazur_zeline_murarude_duwivabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_5fa09fb145c78.pdfIn PDF document text
    • https://lilepixot.weebly.com/uploads/1/3/4/4/134462463/4940547.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/698507.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/4538247.pdfIn PDF document text
    • https://bumujonawomete.weebly.com/uploads/1/3/4/4/134435367/8e5a915903.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/9060f297-1005-42c3-a42c-8aba0d60bd48/zusoretij.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/17982622149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9314a1fe-b493-44c2-a96c-df67eaea26cf/generator_manual_transfer_switch_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/764fafa7-3658-4b4c-b72e-e24792c95c0b/kutasose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ed8bb8-5f9a-48af-9349-6c4f85634f26/a_different_mirror_chapter_11_summary.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_off0000cf77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF77 4904 bytes
SHA-256: e7efa5f60d82c0fb8f19c9e1e688ecbe63e0ac71d49fc4db731960ef3f6aa22d
font_01_sfnt_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 11060 bytes
SHA-256: 14c02d86c2cfc1711550afcc93fa6c6675d10d24136eea9f6f0d4f1db88815f7

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